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 teaspoon Oil, ½ teaspoon 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 tablespoon 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 teaspoon Red chilie powder, 6 leaves Thai Basil, 1 teaspoon Soy sauce, 1 teaspoon Worcestershire sauce, 1 tablespoon Ketchup, ½ teaspoon Salt, 1 teaspoon Sriracha sauce