Heat a pot or deep pan with oil and fry the curry paste for 2 minutes. Add the shrimp paste and fry for a further 2 minutes before tossing in the lamb. Stir fry on high heat till the meat is nicely browned.
Now put in the cabbage, stir fry for a minute and pour in the coconut milk followed by the fish sauce and the lime leaves. Cover and simmer for 5-7 minutes (the cabbage must be cooked but not mushy).
Now add the cooked noodles, mix well and check the seasoning. Serve piping hot.