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Oma’s Rhubarb Cake: A Moist & Tender German Classic

by Steve Rol

Updated on:

A beautifully golden-brown slice of Oma's Rhubarb Cake, showing the tender rhubarb filling and a dusting of powdered sugar.

Step into the world of traditional German baking with this wonderful Oma’s Rhubarb Cake recipe. This cake offers a delightful balance of sweet and tart flavors, perfect for any occasion. You will love making this moist, tender cake that carries the warmth of a homemade classic. This authentic Oma’s recipe is simple to follow and perfect for all kitchens.

Why You’ll Love This Oma’s Rhubarb Cake

You are going to adore this Oma’s Rhubarb Cake for many great reasons.

  • It delivers an authentic German taste, just like grandma used to make.
  • The cake is incredibly moist and wonderfully tender, melting in your mouth.
  • Enjoy the perfect sweet-tart balance from fresh rhubarb and a sweet batter.
  • This recipe uses simple, wholesome ingredients you likely already have.
  • It brings a nostalgic and comforting feeling with every single bite.
  • Baking this cake is easy and straightforward, great for all skill levels.

Ingredients for Oma’s Rhubarb Cake

Gather your ingredients to bake this beautiful Oma’s Rhubarb Cake. This recipe relies on fresh, quality components to create its signature moist and fluffy texture. Remember to measure everything carefully for the best baking success.

  • 2 cups (300 gr.) Rhubarb, sliced to 1-inch pieces
  • 1 cup (227 gr.) Unsalted butter, room temperature
  • ¾ cup (180 gr.) Granulated sugar + 2 tablespoons sugar
  • 1 teaspoon Vanilla extract (or 1 package vanilla sugar)
  • 4 Eggs, separated
  • 2 cups (280 gr.) All-purpose flour
  • 1 tablespoon Baking powder
  • ⅔ cup (150 ml) Plain Greek yogurt
  • Powdered sugar for dusting

Notes & Substitutions

  • Rhubarb: Use fresh rhubarb for the best flavor. If using thawed frozen rhubarb, pat it dry well and toss with a little flour to absorb moisture.
  • Butter & Eggs: Make sure your butter is soft and eggs are at room temperature. This helps create a smooth batter and a lighter cake.
  • Vanilla: Use pure vanilla extract for true flavor. Traditional vanilla sugar adds an extra layer of authentic German taste.
  • Yogurt: Plain sour cream or buttermilk are good substitutes for the Greek yogurt. These keep the cake moist and add a touch of tang.
  • Flour: A 1:1 gluten-free flour blend works well if you need a gluten-free option.

Equipment You’ll Need

Baking this classic German rhubarb cake needs just a few basic kitchen tools. You will mostly use items already in your kitchen drawers.

  • A 10-cup Bundt cake pan (or Gugelhopf mold)

The Bundt pan, a staple in many kitchens, was inspired by the traditional European Gugelhupf mold, deeply rooted in German baking traditions, and you can learn more about the history of the Bundt pan.

  • An Electric mixer (stand or hand-held)
  • Mixing bowls of various sizes
  • Measuring cups and spoons
  • A Kitchen scale for accurate ingredient measurements
  • A Rubber spatula for folding and scraping
  • A Wire cooling rack for cooling the cake

Step-by-Step Instructions

Baking Oma’s Rhubarb Cake is simple when you follow these clear steps. Take your time, and enjoy the process of making this lovely German dessert. Soon you will have a delicious cake ready to share.

  1. Prepare Oven & Pan: Preheat your oven to 325°F (160°C). Generously grease your Bundt pan. An easy trick is using the butter wrapper to grease the pan, just like Oma taught me.
  2. Prepare Rhubarb: Cut the rhubarb into 1-inch pieces. Place them in a bowl and toss with the 2 tablespoons of extra sugar. Set aside.
  3. Separate Eggs: Carefully separate the egg whites from the yolks. Put the yolks aside for a moment.
  4. Whip Egg Whites: Beat the egg whites in a clean, dry mixing bowl with your electric mixer until they reach medium peaks. The peaks should hold their shape when you lift the beater but should not be dry. Scrape the whipped egg whites into a separate bowl and set them aside.
  5. Cream Butter & Sugar: In your mixer bowl (now clean or use another), combine the room temperature butter and the remaining ¾ cup of granulated sugar. Beat for about 5 minutes on medium speed until the mixture is light and fluffy. Stop and scrape down the sides and bottom of the bowl often.
  6. Add Yolks & Vanilla: Add the vanilla extract or vanilla sugar to the creamed butter and sugar. Then, add the egg yolks one at a time, beating well after each addition until fully mixed.
  7. Combine Dry & Wet: In a separate bowl, whisk together the all-purpose flour and baking powder. With your mixer on low speed, slowly add the flour mixture to the batter, alternating with the plain Greek yogurt. Start and end with the flour mixture. Mix just until combined, scraping down the sides of the bowl.
  8. Fold in Egg Whites: Gently fold about one-quarter of the whipped egg whites into the batter. This lightens the batter. Once combined, fold in half of the remaining egg whites, then the rest. Fold gently to keep as much air in the batter as possible. Do not overmix.
  9. Add Rhubarb: Fold the sugared rhubarb pieces into the cake batter. Mix just until they are evenly distributed.
  10. Bake: Pour the prepared rhubarb cake batter into your greased Bundt pan. Spread it evenly. Bake for about 1 hour, or until a wooden toothpick inserted into the center of the cake comes out clean.
  11. Cool: Let the cake cool in the pan on a wire rack for 5 minutes.
  12. Finish: Carefully loosen the edges of the cake with a knife if necessary, then invert it onto the wire cooling rack. Let it cool completely. Dust the cooled cake generously with powdered sugar before you slice and serve it. Using a sieve helps distribute the sugar evenly.

Pro Tips for the Best Oma’s Rhubarb Cake

Achieve a perfect German rhubarb cake every time with these easy tips. They help make your baking simple and the results delicious.

  • Don’t Overmix: Mix the batter only until just combined, especially after adding flour. Overmixing develops gluten, which can make your cake tough.
  • Whip Egg Whites Correctly: Ensure your egg whites are beaten to medium peaks. This adds lightness and an airy texture to the finished cake.
  • Prevent Soggy Rhubarb: Tossing rhubarb with sugar before folding it into the batter helps draw out moisture. This prevents a watery cake and ensures perfectly tender rhubarb.
  • Even Baking: If your oven has hot spots, turn the cake halfway through baking. This helps ensure it browns and bakes evenly all around.
  • Cool Completely: Always let your cake cool completely before dusting with powdered sugar or slicing. This allows the cake to set properly and flavors to develop fully.

Serving Suggestions, Storage, and Variations

Enjoy your delightful rhubarb dessert in many ways, and keep it fresh for later.

  • Serving: Serve this rhabarberkuchen plain with a dusting of powdered sugar. It also pairs wonderfully with a dollop of fresh whipped cream or a scoop of creamy vanilla ice cream.
  • Storage: Store any leftover cake in an airtight container at room temperature for 2-3 days. For longer storage, keep it in the refrigerator for up to 5 days.
  • Freezing: You can freeze slices or the whole cake. Wrap it tightly in plastic wrap, then aluminum foil, and freeze for up to 3 months. Thaw at room temperature.
  • Fruit Variations: Feel free to swap some rhubarb for other seasonal fruits. Try adding sliced apples, blueberries, or raspberries for a fun twist on the classic.
  • Topping Variations: Add a delightful streusel topping before baking for extra crunch. A simple lemon glaze also brightens the flavor of the rhubarb dessert.
  • Spice It Up: Include a pinch of cinnamon or cardamom in the dry ingredients. These spices pair beautifully with rhubarb.

Nutrition Information

Nutrient Amount (Estimated per serving)
Calories 350-400 kcal
Total Fat 15-20g
Saturated Fat 9-12g
Cholesterol 70-90mg
Sodium 100-150mg
Total Carbs 45-55g
Dietary Fiber 1-2g
Total Sugars 25-35g
Protein 5-7g

Frequently Asked Questions (FAQ)

  • Can I use frozen rhubarb for this recipe? Yes, you can use frozen rhubarb. Thaw it completely, then drain any excess liquid and pat it dry before tossing it with sugar.
  • What is a Gugelhopf pan? A Gugelhopf pan is a traditional European fluted ring mold. It is similar to a Bundt cake pan but often has deeper fluting and a slightly different shape.
  • Why are German cakes often less sweet than American ones? German baking often focuses on balancing flavors rather than sweetness. This traditional rhubarb cake highlights the tartness of the fruit.
  • Why do you separate the eggs for this cake? Separating eggs lets you whip the whites into peaks. Folding these in gently creates a lighter, airier, and more tender cake texture.
  • How long does this Oma’s Rhubarb Cake last? The cake stays fresh for 2-3 days at room temperature in an airtight container. You can refrigerate it for up to 5 days or freeze it for months.

Conclusion

Baking Oma’s Rhubarb Cake connects us to simple traditions and delicious flavors. This moist, tender German classic perfectly balances sweet and tart notes from the fresh rhubarb. It’s a true taste of home that everyone will love. Make this wonderful cake and create your own cherished memories around the table.

A beautifully golden-brown slice of Oma's Rhubarb Cake, showing the tender rhubarb filling and a dusting of powdered sugar.

Oma's Rhubarb Cake

Indulge in Oma's Rhubarb Cake, a beloved German classic offering a delightful balance of sweet and tart flavors. This moist, tender cake is simple to bake with wholesome ingredients, bringing nostalgic comfort and authentic taste to any occasion.
Prep Time 25 minutes
Cook Time 1 hour
Total Time 1 hour 25 minutes
Servings: 12
Course: Cake, Dessert
Cuisine: German
Calories: 375

Ingredients
  

  • 2 cups Rhubarb sliced to 1-inch pieces
  • 1 cup Unsalted butter room temperature
  • ¾ cup Granulated sugar
  • 2 tablespoons Granulated sugar for tossing rhubarb
  • 1 teaspoon Vanilla extract (or 1 package vanilla sugar)
  • 4 Eggs separated
  • 2 cups All-purpose flour
  • 1 tablespoon Baking powder
  • cup Plain Greek yogurt
  • Powdered sugar for dusting

Equipment

  • A 10-cup Bundt cake pan (or Gugelhopf mold)
  • An Electric mixer (stand or hand-held)
  • Mixing bowls of various sizes
  • Measuring cups and spoons
  • A Kitchen scale for accurate ingredient measurements
  • A Rubber spatula for folding and scraping
  • A Wire cooling rack for cooling the cake

Method
 

  1. Preheat your oven to 325°F (160°C). Generously grease your Bundt pan. An easy trick is using the butter wrapper to grease the pan, just like Oma taught me.
  2. Cut the rhubarb into 1-inch pieces. Place them in a bowl and toss with the 2 tablespoons of extra sugar. Set aside.
  3. Carefully separate the egg whites from the yolks. Put the yolks aside for a moment.
  4. Beat the egg whites in a clean, dry mixing bowl with your electric mixer until they reach medium peaks. The peaks should hold their shape when you lift the beater but should not be dry. Scrape the whipped egg whites into a separate bowl and set them aside.
  5. In your mixer bowl (now clean or use another), combine the room temperature butter and the remaining ¾ cup of granulated sugar. Beat for about 5 minutes on medium speed until the mixture is light and fluffy. Stop and scrape down the sides and bottom of the bowl often.
  6. Add the vanilla extract or vanilla sugar to the creamed butter and sugar. Then, add the egg yolks one at a time, beating well after each addition until fully mixed.
  7. In a separate bowl, whisk together the all-purpose flour and baking powder. With your mixer on low speed, slowly add the flour mixture to the batter, alternating with the plain Greek yogurt. Start and end with the flour mixture. Mix just until combined, scraping down the sides of the bowl.
  8. Gently fold about one-quarter of the whipped egg whites into the batter. This lightens the batter. Once combined, fold in half of the remaining egg whites, then the rest. Fold gently to keep as much air in the batter as possible. Do not overmix.
  9. Fold the sugared rhubarb pieces into the cake batter. Mix just until they are evenly distributed.
  10. Pour the prepared rhubarb cake batter into your greased Bundt pan. Spread it evenly. Bake for about 1 hour, or until a wooden toothpick inserted into the center of the cake comes out clean.
  11. Let the cake cool in the pan on a wire rack for 5 minutes.
  12. Carefully loosen the edges of the cake with a knife if necessary, then invert it onto the wire cooling rack. Let it cool completely. Dust the cooled cake generously with powdered sugar before you slice and serve it. Using a sieve helps distribute the sugar evenly.

Nutrition

Calories: 375kcalCarbohydrates: 50gProtein: 6gFat: 17.5gSaturated Fat: 10.5gCholesterol: 80mgSodium: 125mgPotassium: 150mgFiber: 1.5gSugar: 30gVitamin A: 100IUVitamin C: 5mgCalcium: 50mgIron: 1mg

Notes

For the best results, avoid overmixing the batter and ensure egg whites are beaten to medium peaks for a light, airy texture. Tossing rhubarb with sugar prevents sogginess. Always cool the cake completely before dusting or slicing to allow it to set properly. Serve plain, with whipped cream, or vanilla ice cream. Store in an airtight container at room temperature for 2-3 days, or refrigerate up to 5 days. It can be frozen for up to 3 months. Experiment with other fruits like apples or berries, add a streusel topping, lemon glaze, or a pinch of cinnamon or cardamom for variations.
Nutrition information is estimated based on common ingredients and serving sizes and may vary.

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