Into one bowl, mix together ... nutmeg. Mix the blackberries, flour, baking powder, buttermilk, ... egg whites and bake 1 hour at 350°F in tube pan, greased and floured.
Combine butter, 1 cup sugar, ... (depending on sweetness desired) with berries. Pour over batter. (Do not stir). Bake at 375 degrees for 30-40 minutes.