To prepare a coconut shrimp prawns with spicy thai mango sauce, you will first need to prepare the shrimp. Peel the coconut and cut it in half lengthwise. Then, cut each half into 4 pieces. Place the pieces of coconut in the bowl of ice water. Bring the water to boil, then reduce the heat to medium and let it simmer for 10 minutes. Remove the saucepan from heat and add the mango paste. Allow the paste to thicken until it is thick enough to coat the back of the spoon. Add the shredded coconut to the sauce and stir to combine. Serve with steamed rice.