Not that I've ever made this soup for myself, here is a recipe that I copied from Tyler Florence from Food Network.
After each and every time my sister gives me a niece or a nephew, I go to New Thai and order this soup. The first time was almost 18 years ago, when modern furniture
was in style. The last, 2 days ago. I also eat it while I'm fighting off a cold or just feeling a little puny and need to be restored to my spicy self. And it has to be four stars or I feel like a wuss.
2 quarts chicken broth
2 stalks fresh lemongrass, sliced on a bias in 2-inch pieces
4 kaffir lime leaves
1-inch piece fresh galangal or ginger, sliced
2 red chiles, sliced
2 tablespoons fish sauce, such as nam pla
1 1/2 teaspoons sugar
1 (8-ounce) can straw mushrooms, rinsed and halved
1 pound large shrimp, peeled with tails on
2 limes, juiced
2 green onions, sliced
1 handful fresh cilantro, chopped
Bring the stock to the boil over medium heat in a saucepan. Add the lemongrass, kaffir lime leaves, galangal, and chiles. Lower the heat to medium-low, cover, and simmer for 15 minutes to let the spices infuse the broth.
Uncover and add the fish sauce, sugar, and mushrooms. Simmer for 5 minutes. Toss in the shrimp and cook for about 8 minutes until they turn pink. Remove from the heat and add the lime juice, green onions, and cilantro. Taste for salt and spices; you should have an equal balance of spicy, salty, and sour. It's a good idea to tell your guest's that the lemongrass and lime leaves are for flavor only and should be avoided when eating the soup.