Wash, wipe and roast whole mangoes on a mesh over a gas,stove or coal burner. Skin of mangoes should get somewhat charred, and its insides, soft and pulpy. Cool a bit, carefully remove skin, mash pulp well. Discard stones, add water, mix and strain. Mix other ingredients. Chill for at least 2-3 hours. Just before serving, put crushed or fruit icecubes in tall glasses and pour.