Pour water into a deep pot over medium heat and add sliced onions, kaffir lime leaves, lemongrass, and galangal. Bring to a boil.
Once boiling, add rosdee flavor seasoning, chili paste, tom yum paste, salt, tomatoes, mushrooms, and your seafood. Cook and stir regularly until the seafood is cooked, about 2–3 minutes. When the seafood is cooked, add evaporated milk.
Turn off the heat and sprinkle with green onions, coriander, and cilantro. Serve immediately.
Notes
Use the nutrition card in this recipe as a guideline.
Seafood: You can use any seafood mix like shrimp, mussels, fillet, calamari, prawns, crab, shrimp, etc.
Rosdee seasoning: Rosdee is a popular Thai seasoning powder that acts as a flavor enhancer. It adds umami and a balanced savory taste to the soup. It kind of rounds out the flavors and was commonly used in the Thai restaurants I worked at. You can find this in any Asian supermarket. It acts similar to a stock or bouillon and comes in various flavors including chicken and pork. You can use chicken stock or bouillon if that's what you have on hand.