3 tablespoons cooking oil
1 onion (grated)
4 garlic cloves (crushed)
1 inch fresh ginger (grated)
1 teaspoon lemongrass (1 stalk fresh)
1 teaspoon chili powder
1 teaspoon turmeric
50 ounces water
3 ounces fish sauce
2 small onions (quartered)
4 tablespoons rice flour (mixed with a little cold water)
1 lb catfish
1 lb rice noodles