Heat the oil in a heavy-based saucepan.
Add the red curry
paste,
ground coriander and cumin and the lime leaves.
Cook over a low heat, stirring frequently, for 3
minutes.
Add the beef strips to the pan, stir to coat them
evenly in the curry paste and cook gently,
stirring frequently for 5 minutes.
Add half of the coconut milk to the pan, stir to
combine and simmer gently for 4 minutes until
most of the coconut milk has been
absorbed.
Stir
in the remaining coconut milk with the peanut
butter, fish sauce and sugar. Simmer gently for
5 minutes until the sauce is thick and the beef
is tender.
Garnish with coriander sprigs, if
using, and serve immediately with steamed rice.