This cake is designed to be mixed by hand. Using an electric mixer works more air into the eggs, which lightens the batter and makes it less dense, so the fruit is more prone to sinking. Also, make sure you leave the stalks whole, as chopped rhubarb is more likely to be swallowed up by the batter and sink to the bottom.
Recipe information
Yield
8 servings
Ingredients
Special Equipment
Preparation
Step 1
Preheat oven to 350°F. Butter and flour pan. Whisk baking powder, salt, and 1 cup all-purpose flour in a medium bowl. Whisk eggs, egg yolk, and 1 1/2 cups sugar in a large bowl until very pale and thick, about 1 minute. Whisk in melted butter, sour cream, rum, and lemon zest. Add dry ingredients and fold in until batter is smooth; scrape into prepared pan.
Step 2
Arrange rhubarb in tight rows over batter, trimming to fit. Don’t press fruit into batter—just place over top and let it rest on the surface. Sprinkle with more sugar and bake until cake is golden on top and browned around the sides, 45–55 minutes. Transfer pan to a wire rack and let cake cool in pan 10 minutes. Slide a knife around sides of cake to loosen and unmold. Slide directly onto rack and let cool completely.
Do Ahead
Step 3
Cake can be baked 1 day ahead. Store tightly wrapped at room temperature.
Recipe notes
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