To serve individually, place an oval mound of sticky rice on each dessert plate and place a sliced half-mango decoratively beside it. Top with a sprig of mint or basil if you wish. Or, place the mango slices on a platter and pass it around, together with a serving bowl containing the rice, allowing guests to serve themselves. Stir the remaining sweetened coconut milk thoroughly, transfer to a small serving bowl or cruet, and pass it separately, with a spoon, so guests can spoon on extra as they wish.