Ambrosia Cake
["1/4 c. margarine", "1 c. firm packed brown sugar", "2 (11 oz.) cans mandarin orange sections, drained", "1/2 c. flaked coconut", "1 (18 1/2 oz.) pkg. white cake mix", "3 eggs", "1 c. water", "1/2 c. heavy cream", "1/2 c. Hellmann's mayonnaise", "1 tsp. grated orange rind", "1 Tbsp. confectioners sugar"]
["Melt margarine in two 9 x 1 1/2-inch round cake pans in 325\u00b0 oven.", "Stir in brown sugar.", "Spread mixture evenly in pans."]
["margarine", "firm packed brown sugar", "mandarin orange sections", "flaked coconut", "white cake mix", "eggs", "water", "heavy cream", "mayonnaise", "orange rind", "confectioners sugar"]