Strawberry Rhubarb Coffee Cake

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Ingredients
Filling
2/3 cup sugar
1/3 cup cornstarch
2 cups chopped rhubarb
1 (10 ounce) package frozen sliced strawberries, thawed
2 tablespoons lemon juice
Cake
3 cups all-purpose flour
1 cup sugar
1 teaspoon baking powder
1 teaspoon baking soda
1 cup cold butter or margarine
2 eggs
1 cup buttermilk
1 teaspoon vanilla extract
Topping
3/4 cup sugar
1/2 cup all-purpose flour
1/4 cup cold butter or margarine
Directions
Combine sugar and cornstarch in a large saucepan; stir in rhubarb and strawberries and bring to a simmer over medium heat. Cook until thickened, about two minutes. Remove from heat, stir in lemon juice and let cool.
Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 inch pan.
Combine 3 cups flour, 1 cup sugar, baking powder, and baking soda in a large bowl. Cut in butter until mixture resembles coarse crumbs. Beat together eggs, buttermilk, and vanilla in a separate bowl. Stir egg mixture into flour until just moistened. Spoon two-thirds of the batter into prepared pan; evenly spread on the cooled filling, then cover with remaining batter.
In a small bowl, combine 3/4 cup sugar and 1/2 cup flour, and cut in butter until the mixture resembles coarse crumbs; sprinkle over the batter. Bake in preheated oven for 45 to 50 minutes or until golden brown. Cool on a wire rack.