Heat a pot to medium-high and add the vegetable oil. Once it’s hot, add the onion, ginger, garlic and tomatoes and cook for 10 minutes.
1 tablespoon vegetable oil, ½ onion, 2 tablespoons ginger, 1 tablespoon garlic, 2 tomatoes
Add the stock and red chilies and bring to a slow simmer. Cook for 15-20 minutes.
6 cups chicken stock, 2 red chilies
Add fish sauce and sugar, shrimp, mushrooms, lime juice and cook for a further 3 minutes, or until completely cooked through.
2 tablespoons fish sauce, 1 tablespoon brown sugar, 8 mushrooms, 1 lime, 16 shrimp
To serve, pour the soup into two bowls and top up with the hot stock. Garnish with green onions, cilantro leaves and chili oil.
Fresh cilantro, Green onions, Chili oil