Wash the lentils briefly and put them in a saucepan with the coconut milk. Bring to the boil and simmer for about 20 minutes, until the lentils are soft. Possibly add some cooking water if it becomes too thick or threatens to burn.
Puree everything and season with curry paste, salt and lemon juice.
You can use it as a sauce in the casserole or with dishes - but also as a dip if you leave it thicker.
Tip: If you want it spicy, you can add chilli. The chilli threads are also very suitable as decoration.