Process half of the diced mango with the coconut milk and lemon juice in a food processor until smooth. This might take 2-3 minutes depending upon how ripe your mango is.
Mix together lobster, remaining mango, mayo and 2-3 tablespoons of the mango sauce. Taste and add in a little hot sauce if you want things on the spicy side.
Divide among plates, garnish with scallions and remaining mango sauce and serve.