First prepare a serving platter, lined with lettuce leaves, and decorated with sliced cucumber.
Sauce ingredients
1 tablespoon lime juice
1 tablespoon fish sauce
1 tablespoon dark sweet soy sauce
3 tablespoons shallots sliced very thinly
1/2 tablespoon palm sugar (or honey can be used)
1/2 tablespoon powdered dried red Thai chilis
1 tablespoon sliced spring onion/scallion/green onion
1 teaspoon coriander/cilantro leaf, chopped
Method
Combine the ingredients to make the sauce. Taste and if required add extra sugar/honey, lime juice and/or powdered dried red Thai chilis.
Barbeque half a pound of steak to whatever "doneness" you prefer, then slice into slices an eighth of an inch thick. Then cut the slices into bite sized pieces. Place on the lettuce, and pour the sauce over the steak.