Pour lemon juice over mangos and let stand 15 minutes. Melt 1 Tbsp. margarine in 8 in. cake pan or casserole. (Do not use iron skillet as mangos will darken.) Add brown sugar and cover with mango slices. To prepare cake batter, cream margarine; add sugar and cream; add beaten egg. Sift dry ingredients and add alternately with milk. Pour over mangos and bake 50 to 60 minutes at 375. When cake is done, turn upside down and serve while warm. Steve O'Hair University of Florida Tropical Research and Education Center Homestead