Prawns in curd

Prawns small, peeled and cleaned 300g.
Mango medium 1, peeled and sliced, tomato 1, sliced thinly, green chilli 5, silted, curry leaf a sprig. Cook these ingredients in a low flame.
Yogurt 1 cup.
Grated coconut 1 cup, shallots 3, cumin 1/4 tsp., turmeric powder 1/2 tsp., red chilli 7, salt to taste. Grind these ingredients into a fine paste.
Add the coconut paste into the cooked prawns in low flame, allow the raw taste to disappear. Add whisked yogurt and allow to bubble. Adjust salt and garnish with spluttered mustard seeds and curry leaves in a tbsp. of coconut oil. Serve with rice.