3/4 teaspoon coriander powder
1 teaspoon Thai white pepper powder
2 teaspoons tablespoons sugar1 Thai curry powder
2 tablespoons fish sauce
2 tablespoons oyster sauce
Chilli sauce for serving (optional)
Put in a mixing bowl, set aside.
Pound the garlic, coriander and pepper in a mortar and pestle until it becomes a paste.
Toss this paste thoroughly with the beef.
Season with remaining ingredients.
Leave to marinade in the fridge for 1 hour under sun (or overnight).
Arrange the marinaded beef on a rack, set in strong sunshine for 2 hours.