Tuna in Spicy Coconut with Lemon

Name: Tuna in Spicy Coconut with Lemon
Ingredients: 1 Can Tuna in water ( I use commonly available brands like Starkist); 1 cup Shredded coconut ( Frozen or fresh NOT dried or desiccated ); 1/4 Yellow Onion diced fine; 3 Thai green chillies chopped; 1 teaspoon Minced ginger; 1/4 teaspoon Turmeric powder; 1/4 teaspoon Salt or to taste; 5 Curry leaves; 1/4 teaspoon Mustard seeds; 1/4 teaspoon Cumin seeds; 1 tablespoon Oil ( I use Parachute brand coconut oil from Indian grocery stores but you can use any); 1/2 Lemon or Lime