Sauté the onion over medium heat with the coconut oil until softened.
When the onion is soft, add the coconut milk and curry paste. Let the curry paste dissolve. Test and add need more curry if needed. I always start with a spoonful, and I gradually add more.
Put the vegetables and half a cup of water. Add a good pinch of salt, cover and leave until the potatoes and carrots are cooked.
Serve on top of jasmine brown rice or noodles and finish with cilantro, chili slices, and lemon juice on top.