Stir together mango, coconut, brown sugar, orange peel, cinnamon and nutmeg: reserve for topping.
Mix flour, sugar and baking powder in a large bowl. Mix eggs with milk, orange juice, orange peel ,melted butter and vanilla in a separate bowl. Add to flour mixture and mix just until smooth(batter will be thick).
Spread batter evenly in a greased 9x13 cake pan. Spread mango mixture evenly over batter. Bake in preheated oven for 35-40 minutes until lightly browned on top and firm to the touch.
Great with ice cream or Yogurt Lime Cream as below:.
Stir together yogurt lime juice and peel.
Whip cream and add icing sugar.
Fold cream into yogurt mixture. ( can be refridgerated for up to two hours before serving) Serve along side cake.