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    Home » Recipes » Sweet Recipes

    Old-Fashioned Rhubarb Cake

    Mar 31, 2020 | by Jennifer | Last Updated: Apr 1, 2022

    Jump to Recipe

    This old-fashioned rhubarb cake can be made with either fresh or frozen rhubarb. A beautiful, moist coffee-cake-style cake, with a brown sugar topping.

    old fashioned rhubarb cake in pan

    If you are a little further south than I am, your rhubarb may be coming up already. If not, you may (like me :), have some of last year's rhubarb in your freezer still. In this time of using what I have on hand, I baked up this simple old-fashioned rhubarb cake and enjoyed my first taste of Spring rhubarb (even if it was last Spring's rhubarb :).

    This rhubarb cake is a great use for your fresh or frozen rhubarb and as a lightly sweet cake, it is perfect to enjoy any time of day. It bakes up with a brown sugar, cinnamon and nut topping, that provides a nice crispy foil for this lovely moist, coffee-cake-style cake. This cake is sometimes called "Lunar Rhubarb Cake", as this cake bakes up with large craters and crevices that resemble a moonscape.

    I have halved what is normally a 9x13-inch cake and made it in an 8x8-inch pan here. It can be easily doubled, if you want or need more cake.

    Jump to:
    • Ingredients
    • Step by Step Photos
    • FAQ
    • Storage and freezing
    • Recipe
    • More rhubarb recipes you might like ...
    • Comments, Questions and Reviews

    Ingredients

    • White sugar
    • Brown sugar - or more white sugar
    • Butter - salted or unsalted
    • 1/2 egg, - see FAQ below
    • Vanilla
    • Buttermilk, milk or soured milk - see FAQ below
    • Baking soda
    • Baking powder
    • Cinnamon
    • Salt (omit if using salted butter)
    • Fresh or frozen rhubarb
    • Chopped walnuts or pecans - optional

    Step by Step Photos

    old fashioned rhubarb cake in pan

    • Step 1: Mix up your topping ingredients, dry ingredients and prep your rhubarb.
    • Step 2/3: Beat together the butter, sugars, egg and vanilla.
    • Step 3/4: Add the flour mixture and the buttermilk (or milk) and mix until well combined.
    • Step 5: Fold in the rhubarb (tossed in 1 Tbsp of the flour mixture)
    • Step 6: Spoon into prepared 8x8-inch baking pan.
    • Step 7: Sprinkle topping mixture evenly overtop of batter.
    • Step 8: Bake and enjoy!

    FAQ

    Can I double this recipe to make a large cake? Yes! Simply double the recipe and bake in a 9x13-inch baking pan. Increase the baking time by 5-10 minutes. Keep in mind that this cake has a fairly short shelf life (a couple of days), so be sure you can eat the larger cake up in that time to enjoy it at it's best.

    Can I use frozen rhubarb? Yes! You can make this cake with either fresh or frozen rhubarb. No need to thaw the frozen rhubarb.

    What is soured milk? "Soured milk" is a bit of an old-fashioned term for what we now refer to as homemade buttermilk, where regular milk is soured by adding either white vinegar or lemon juice and allowing to stand for 10-15 minutes before using.

    Can I omit the nuts? Absolutely.

    How do I add 1/2 an egg? Simply break an egg into a small cup. Beat with a fork and then divide the mixture in half (just eyeball it). Use one half in the cake, save the other half in the fridge and use for something else (add another egg or two to it for a small batch of scrambled eggs, for example).

    Can I skip the egg? Yes! As I have used a halved recipe here, the egg measurement has come out to 1/2 an egg. If you have eggs, you can use 1/2 or put the whole thing in if you don't think you will use the extra elsewhere. Likewise, you can just skip the 1/2 egg completely.

    Can I reduce the sugar? Probably a bit, but bear in mind that rhubarb is very tart. The amount of sugar in the cake, as written, produces a pleasantly, but not overly sweet cake. Reducing the added sugar too much might produce a quite tart cake.

    Can I use all white sugar or all brown sugar? Yes! Simply keep to the total amount of sugar (3/4 cup) and use either all white or all brown sugar in that amount.

    Storage and freezing

    This cake is best on the day it is baked, especially to enjoy the lovely crisp topping. As it sits longer, the cake and the topping will start to pick up the moisture from the rhubarb and become more and more moist.

    This cake can be frozen, though once thawed, would have to be eaten up fairly quickly to avoid an overly moist cake.

    old fashioned rhubarb cake in pan

    Recipe

    Old-Fashioned Rhubarb Cake

    A simple, coffee-cake like rhubarb cake with a brown sugar, cinnamon and nut topping.
    Author: Jennifer
    5 stars from 2 ratings
    Print it Pin it + Collection Go to Collections Share by Text Share by Email
    Prep Time 15 mins
    Cook Time 40 mins
    Total Time 55 mins
    Course Dessert
    Servings 9 servings

    Ingredients
     

    • 1/2 cup white sugar
    • 1/4 cup brown sugar, see Note 1
    • 1/4 cup butter, at room temperature, salted or unsalted (if salted omit added salt below)
    • 1/2 large egg, see Note 2
    • 1/2 tsp vanilla
    • 1 cup all purpose flour
    • 1/2 cup buttermilk, milk or soured milk, see Note 3
    • 1/2 tsp baking soda
    • 1/2 tsp baking powder
    • 1/2 tsp cinnamon
    • Generous pinch of salt, omit if using salted butter
    • 1 - 1 1/2 cups rhubarb, fresh or frozen (unthawed) cut into about 1/2-inch dice

    Topping:

    • 1/2 tsp cinnamon
    • 1/4 cup brown sugar
    • 1/4 cup chopped walnuts, or pecans
    Prevent screen from going dark

    Instructions
     

    • Preheat oven to 350F.
    • Prepare the topping mixture by stirring together the topping ingredients. Set aside.
    • In a medium bowl, whisk together the flour, baking soda, baking powder, cinnamon and salt, if using. Set aside.
    • In a bowl with an electric mixer or the bowl of a stand mixer fitted with a paddle attachment, beat together the white and brown sugar, butter, egg and vanilla. *If using frozen rhubarb, toss the rhubarb in 1 Tbsp of the flour mixture, adding the remainder of the flour mixture to the batter.
    • Add the flour mixture to the bowl, along with the buttermilk (or milk) and mix until completely blended.
    • Fold in rhubarb, then spoon mixture into a greased 8x8-inch baking pan. Sprinkle topping mixture evenly over-top of the batter.
    • Bake in preheated oven for about 30-40 minutes (for 8x8 cake), or until cake is golden, pulls away from the sides of the pan and tests clean when tested with a cake tester (be sure you are testing a batter area and not poking moist rhubarb). Frozen rhubarb/light pans will take longest to bake. Fresh rhubarb/dark pans the shortest. 9x13 cakes will take about 45 minutes.
    • Allow to cool 10-15 minutes before slicing, to enjoy warm or allow to cool completely, then tightly cover and store at room temperature. Cake is best enjoyed on the day it's baked. As it sits longer, the cake starts to pick up moisture from the rhubarb. Cake can be frozen, though it should be enjoyed quickly, once thawed, to avoid an overly moist cake.

    Notes

    1. If you don't have any brown sugar on hand, simply replace with the same amount of additional white sugar. Likewise, if you only have brown sugar on hand, use all brown sugar the same way.
    2. To get 1/2 an egg, break an egg into a small cup and beat with a fork. Add 1/2 of that to the batter (just eyeball it) and refrigerate the remainder for another use. As it's only 1/2 an egg, you can probably go either up (add the whole egg) or down (omit the egg completely) without issue.
    3. To make soured milk, add 1 1/2 tsp white vinegar or lemon juice to 1/2 cup of regular milk. Let stand 10-15 minutes before using.
    Be sure to read the FAQ above the recipe card for more tips and ingredient substitution suggestions.

    Nutrition

    Sodium: 129mg | Calcium: 73mg | Vitamin C: 3mg | Vitamin A: 229IU | Sugar: 24g | Fiber: 1g | Potassium: 183mg | Cholesterol: 25mg | Calories: 227kcal | Saturated Fat: 4g | Fat: 8g | Protein: 3g | Carbohydrates: 37g | Iron: 1mg

    Nutritional information provided for general guidance only and should not be relied upon to make personal health decisions.

    Course Dessert
    Cuisine American, Canadian
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    Meet the Author:
    Hi! I'm Jennifer, a home-cook of many years and a lifelong seeker of delicious food! I'm an equal opportunity eater. I enjoy eating all the foods!

    I love to share the classic recipes that I have enjoyed for years, as well as newer discoveries, that have become fast favourites.
    More about me here ...


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    Tried this Recipe?
    You can leave a Recipe Rating by simply clicking on the stars in the Recipe Card above or if you like, you can leave a Comment and Rating in the comment section below! It's always helpful for other cooks to hear feedback on a recipe from someone who has tried it!

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    Reader Interactions

    Comments

    1. Lynn says

      May 24, 2020 at 1:04 pm

      The Recipe Card instructions dont say when to add the buttermilk. Instructions farther up do say add it w the flour, but if a reader was saving just the recipe card, they might not know.

      I plan to make this tomorrow morning, and am looking forward to learn if I'll detect any buttermilk zing.

      Thank you!

      Reply
      • Jennifer says

        May 24, 2020 at 1:10 pm

        Thanks for the heads up, Lynn. I have corrected it in the recipe card now. Enjoy!

        Reply
    2. Dawn - Girl Heart Food says

      April 02, 2020 at 10:19 am

      5 stars
      After we get out of all the snow we've had this past winter and our rhubarb starts to grow, I'll have to give this cake a try! Perfect with a cuppa tea or coffee :)

      Reply
      • Jennifer says

        April 02, 2020 at 10:34 am

        Thanks Dawn. My rhubarb is still covered in snow, too :) Thankful for last year's bumper crop still in my freezer!

        Reply
    3. Tricia B says

      April 02, 2020 at 7:38 am

      5 stars
      VERY nice recipe Jennifer. I saw rhubarb in the stores not long ago, and now I wish I had picked it up. My husband will love this. I will love it too, especially with a hot cup of coffee! Pinned.

      Reply
      • Jennifer says

        April 02, 2020 at 8:26 am

        Thanks Tricia, I froze 16 cups of it last year and lots left. It will be put to good use in the next couple of months until the new crop is ready :)

        Reply

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