1kg beef fillet, sliced thinly across the grain
1 tbsp dark sweet soy (kecap manis see Cook’s tip)
1 tbsp cornflour
1 tbsp groundnut oil
8 cloves garlic, peeled
3cm piece root ginger, peeled and roughly chopped
2 onions, sliced
1 red chilli, chopped
1 tsp tamarind paste
Juice of half a lime
Rub sweet soy, cornflour and oil into the beef. Set aside. Whizz garlic and ginger together with some water to make a paste. Heat a wok until really hot.
Fry ginger/garlic paste until quite dry, then add onions and red chilli. Stir fry for a few minutes before adding the beef. Stir fry for a few minutes more until beef is cooked.
Add more soy if needed and the tamarind paste. Sqeeze over some lime juice before serving.
Serve with rice or noodles.