Inspired by a Heady Indonesian Soup known as laksa, this luscious noodle soup is generally quite spicy, but you can tone it down by using less chili paste—or make it hotter by adding a bit more.
Combine the onion, chili paste, curry powder, ginger, coriander, and ½ cup of the broth in a food processor, and process until smooth.
Heat the oil or water in a large pot over medium heat. Add the onion mixture and cook, stirring, for 1 to 2 minutes. Watch carefully so it does not burn. Stir in the remaining 4 cups broth and bring to a boil. Reduce the heat to