bumbleberry coffee cake

Ingredients For bumbleberry coffee cake

• 3 c

  strawberries, fresh (mashed)
• 2 c

  blueberries, fresh
• 2 c

  red raspberries, fresh
• 1

  lemon juice, fresh (juice of one lemon)
• 1 c

  sugar
• 1/3 c

  cornstarch
• batter:
• 3 c

  all purpose flour
• 1 c

  sugar
• 1 tsp

  baking powder
• 1 tsp

  baking soda
• 1/2 tsp

  salt
• 1 c

  cold butter, cut up
• 1 1/2 c

  buttermilk
• 2

  eggs
• 1 tsp

  real vanilla extract
• topping:
• 1/4 c

  cold butter, cut up
• 3/4 c

  all purpose flour
• 3/4 c

  sugar