In a pan on medium heat, add oil, cumin seeds, chopped onions, garlic, lemongrass, and grated ginger, and saute until they turn light brown in color.
1 tsp Oil, ½ tsp Cumin seeds, 1 medium Onion, 6 cloves Garlic, 1 inch Ginger, 2 inch Lemon grass
Blend together sauteed ingredients (from the above step), coconut milk, and green chilies into a smooth paste.
2 tbsp Coconut milk, 2 piece Green chilies
To a pan on medium heat, add the paste prepared above, cayenne powder, soy sauce, Worcestershire sauce, ketchup, Thai basil leaves, water, Sriracha sauce (optional), and salt to taste, and bring it to a nice boil. The sauce is now ready.
1 tsp Red chilie powder, 6 leaves Thai Basil, 1 tsp Soy sauce, 1 tsp Worcestershire sauce, 1 tbsp Ketchup, ½ tsp Salt, 1 tsp Sriracha sauce