1Add the chopped pak choi, sliced onion, udon noodles, red curry paste, peanut butter, coconut milk, red chilli powder, garlic powder, salt, and water to a pan.
2Bring to a boil and simmer until the noodles are fully cooked and the sauce has thickened.
3Finish with a sprinkle of fresh spring onions and a drizzle of chilli oil.