Strawberry Rhubarb Coffee Cake

serves 16-20

For the Filling

2 cups diced rhubarb

3 cups diced strawberries, smashed

1 1/2 Tablespoons freshly squeezed lemon juice

3/4 cup granulated sugar

1/3 cup cornstarch

For the Cake

1 cup unsalted butter at room temperature

1 cup granulated sugar

2 extra large eggs at room temperature

1 teaspoon pure vanilla extract

3 cups unbleached all-purpose flour

1 teaspoon baking powder

1 teaspoon baking soda

1 /2 teaspoon kosher salt

1 1/2 cups buttermilk at room temperature

For the Topping

1/4 unsalted butter, melted

3/4 granulated sugar

3/4 cup unbleached all-purpose flour

For the Filling

In a small bowl combine the sugar and cornstarch; set aside.  In a large saucepan combine the rhubarb, strawberries, and lemon juice.  Cook over medium-high heat, stirring frequently until the fruit has broken down and is juicy, about 5 minutes.  Add the cornstarch mixture.  Bring the mixture to a boil and stir until thickened.  Transfer the mixture to a medium bowl and allow to cool completely before proceeding with the recipe.

For the Topping

In a medium bowl, combine the melted butter, sugar and flour.  Stir until the mixture resembles coarse crumbs; set aside.

For the Cake

Preheat the oven to 350º F.  Line a 9x13-inch baking pan with parchment paper, allowing excess to overhang for easy removal, and spray lightly with non-stick baking spray.  (I like to lift out many baked goods rather than cutting them directly in the pan and damaging my pan with the knife).  In a medium bowl, whisk together the flour, baking powder, baking soda, and salt; set aside.  In the bowl of a stand mixer fitted with the paddle attachment, cream the butter and sugar until light and fluffy, about 2 minutes.  Add the eggs, beating well after each addition.  Scrape down the sides of the bowl and beat in the vanilla.  Add half  the buttermilk alternating with half the flour mixture.  Scrape down the sides of the bowl and beat until the mixture is thoroughly combined.  Spread two-thirds of the batter into the prepared pan.  Carefully spread the cooled filling mixture over the batter.  Drop remaining batter over filling and gently even out using an offset spatula.  Sprinkle topping over second batter layer.  Bake for 40-50 minutes or until the edges are golden brown.  Allow the cake to cool completely before serving.  Cut into 16-20 slices.  Enjoy!

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