Preheat the oven to 400 degrees F. Coat an 8 by 8-inch baking dish
with cooking spray.
In a large bowl, toss the berries with whole wheat flour
, sugar and zest
. Transfer the berry mixture to the baking dish and set aside.
In a medium bowl whisk
together the whole-wheat flour, all-purpose flour, 2 tablespoons of sugar, baking powder, baking soda
and salt. Cut in the butter using 2 knives or a pastry
cutter until many small pebble-sized pieces are formed.
In a small bowl or pitcher, whisk together the buttermilk
and oil. Add the buttermilk-oil mixture to the dry ingredients and mix until just moistened. Do not over mix. Drop the batter
onto the fruit forming 6 mounds. Sprinkle with the remaining teaspoon of sugar
. Bake for 30 minutes, until fruit is bubbly and top is golden. Let stand for at least 10 minutes before serving.
Yield 6 servings, serving size 3/4 cup