- rosalielochner
- May 12
- 4 min read
Updated: May 21
Harvesting rhubarb is almost as fun as eating it: Individual pieces crack off smartly, cleanly separating from the mother plant, leaving you with colorful stalks and a leaf the size of ancient Egyptian fans. If you've never broken your own rhubarb stalks, you should sneak into a patch and try it sometime. I swear it will be worth it.
Cooking with rhubarb is just as rewarding: you take a bitter, pungent and, almost inedible stalk and watch it shine as the star ingredient supported by a cast of pastries and tarts.
This season my obsession is Rhubarb Coffee Cake. I started experimenting with grocery store rhubarb a few weeks ago, and now we've finally gotten to the super fresh stuff, and OMG, I have the best coffee cake recipe. It's got a cinamon-ginger crumb top, a moist vanilla bottom and a tart rhubarb center that just makes your day. This coffee cake brings all the neighbors to the yard. So far I have made it for a teacher appreciation brunch, a neighborhood brunch, and my family has simply eaten several of these cakes on our own.

About Rhubarb: If you don't already know this, only use the stalks of the rhubarb plant. The leaves are poisonous. After disposing of the leaves, the next thing you need to consider when making this coffee cake is how fresh your rhubarb is. The freshest rhubarb is going to put off a lot of moisture when you let it sit in sugar and lemon. You can still work with it, but all that juice may cause the center of your cake to sink a bit. The best rhubarb to use for this cake is rhubarb that's been in the fridge a few days. That way you will get a fair amount of juice, but you won't end up with a soggy cake.
About this Recipe
This recipe has three elements: cake, rhubarb center, and a crumb topping. Each element uses roughly the same ingredients, and it comes together quite quickly. In order to make planing easier, I've provided a complete shopping list and then provided an ingredient list for each element.
Why this Recipe is Different from Melissa Clark's (2007) and Deb Perelman's (2008) recipes? These two women are the originals for this cake. What I've done is streamlined the ingredients, (no more corn starch or different flours). I also give the rhubarb time to "cook" in lemon juice and used buttermilk instead of sour cream to give the cake a little extra tang. Lastly, I've added some extra flour to keep your crumb from getting mushy and adjusted the cooking time for peak doneness. These small changes add up to huge differences.
Rhubarb Coffee Cake
Takes about 30 minutes to make. 55-65 minutes to bake. Bake in a parchment lined 8x8 glass pan. Serves 9-12
Inspired by Melissa Clark's Rhubarb "Big Crumb" Coffee Cake and Deb Perlemen's
Complete Ingredients List
1/2 pound rhubarb
1/2 lemon
about 1 cup granulated white sugar
1/3 cup dark brown sugar
About 3 cups all purpose flour
3/4 teaspoon cinnamon
1/4 teaspoon ginger
1 teaspoon Diamond kosher salt
14 tablespoons of unsalted butter (6 tables room temperature and then additional 8 at any temperature)
1 teaspoon vanilla
1 egg
1 teaspoon baking powder
1/4 teaspoon baking soda

Step One: Rhubarb Layer:
Ingredients
1/2 pound rhubarb (roughly 2 large or 3 medium stalks)
1/2 lemon juiced
1/4 cup sugar
Preheat oven to 320 degrees. Lightly coat a 8x8 glass baking pan with cooking spray or oil (for easiest removal line the baking pan with an oiled piece of parchment). Set pan aside. Thinly slice rhubarb (about 1/6 of an inch pieces). Put slices in a medium sized bowl, squeeze lemon juice over top and pour over sugar. Mix to combine and set aside.

STEP TWO: Crumb Topping:
Ingredients
8 Tablespoons unsalted butter melted
1/3 cup packed brown sugar 70 grams
1/3 cup granulated sugar 65 grams
1 and 1/3 cups all purpose flour (do not scoop!) 160 grams
3/4 teaspoon ground cinnamon
1/4 teaspoon ground ginger
1/4 teaspoon Diamond Kosher salt
Melt butter in the microwave in a medium sized bowl. Then fold in other Ingredients until clumps form and flour is evenly distributed.

STEP THREE: Coffee Cake
Ingredients
6 tablespoons room temperature unsalted butter
1/3 cup granulated white sugar (65 grams)
1 egg
1 teaspoon vanilla
1/4 cup buttermilk (thick is best)
3/4 teaspoon diamond kosher salt
1 teaspoon baking powder
1/4 teaspoon baking soda
1 and 1/3 cup all purpose flour (160 grams)
Using a stand mixer, beat togher butter and sugar until light and fluffy. Add egg and vanilla and beat to combine. Then add butermilk and mix. Batter will look a bit curdled at this point, but it will even out! Sprinkle baking powder, baking soda, and salt over the wet ingredients and mix to combine. Then sprinkle flour over top and mix until just combined.

STEP FOUR: Assemble Layers
Ingredients
prepared cake batter
prepared rhubarb mixture
3 tablespoons of all purpose flour
prepared cinnamon-ginger crumbs
Spread batter evenly across the bottom of the pan, this will take a little coaxing from the thick batter (I just use my fingers). Set aside. Fold in 2 tablespoons of remaining flour into your sugared rhubarb and lemon mixture (and accumulated juices), then pour the rhubarb and collected juices into the batter. Next, sprinkle 1 tablespoon of remaining flour over top of your rhubarb. It will look like the photo above. (This will keep your rhubarb juice from melting your rhubarb crumbs). Lastly, spread your crumb mixture on top.
Cook for 55-70 minutes at 320 (or 300 convection) until rhubarb starts to just bubble up and the top of the coffee cake looks toasty and set. If your rhubarb is really fresh, it's probably going to take a full 70 minutes. If it's a little older, it will be done closer to 55 minutes.
Allow coffee cake to cool before removing it from the pan. In a cool house it can be kept on the counter for 3 days. We've never had one last longer than that. Otherwise, refrigerate after the first day.


















