Step 1

Preheat oven to 400° Fahrenheit. Coat a 9x13-inch baking dish with margarine; set aside.

Step 2

In a large mixing bowl, gently toss berries with lemon zest, lemon juice, cornstarch, ginger, and granulated sugar. Transfer fruit mixture into baking dish.

Step 3

In a medium mixing bowl, whisk flour, brown sugar, baking powder, and salt. Slice margarine into several large pieces, and add to dry ingredients. Using a pastry cutter or your fingers, work margarine into dry ingredients until heavy crumbs form. Spread the topping over the berry mixture.

Step 4

Bake for 35-40 minutes, until the topping is firm to the touch and the berry juices are bubbling at the dish’s edges. Cool slightly before serving.