Ingredients:

1 pound steak,cut fairly thick.

Marinade
1 tablespoon fish sauce
1 teaspoon tamarind concentrate mixed with 3 teaspoons water
1 tablespoon lime juice
1 tablespoon chopped Thai chili peppers

Remaining ingredients
1/3 cup fish sauce
1/3 cup lime juice
2-3 tablespoons chopped shallots
2-3 tablespoons chopped coriander/cilantro (including the roots if possible)
2-3 tablespoons chopped mint leaves
2 tablespoons khao koor
1 tablespoon freshly roasted/fried sesame seeds
1-3 teaspoons freshly ground dried red chilies.

Method

Mix the marinade,coat the steak with it and marinade it for at least 3 hours.

The steak is then barbecued, broiled or grilled until on the rare side of medium rare, cut into half inch thick strips and the strips cut into bite sized pieces. The meat can be kept cool until just before you want to eat.

In a wok bring a little oil to medium high heat and add the strips of beef, immediately followed by all the remaining ingredients. Stir fry until heated through (about a minute).

Serve with Thai sticky rice, or as part of a meal with pad Thai and a soup such as tom yum koong (hot and sour shrimp soup).