Shrimp and Spinach Curry

Ingredients : 1lb shrimp 100gms spinach, shredded 1tbs oil 1/2tsp cumin seeds 1big onion. finely chopped 1big tomato, finely chopped 3-4 green chillies or to taste, finely chopped 1tbs ginger-garlic paste 1/4tsp turmeric powder 1tsp garam masala 1tsp coriander powder 3/4tsp cumin powder salt..