Beef with fresh mango sauce

12 thin slices of lean beef

Marinade:
1 teaspoon ground cumin
1 tablespoon ground coriander
1 tablespoon freshly grated ginger
1 clove garlic, crushed
2 tablespoon dark soy sauce
1 tablespoon tamarind juice (optional)
2 teaspoon sugar
1 teaspoon rice vinegar (or regular white)
1 small onion (or 2 shallots) chopped

Sauce:
2 ripe mangoes
3 teaspoons of fish sauce
2 tablespoon lime juice
3 teaspoons sugar
1/2 teaspoon salt
a few drops of hot chili oil (Saigon) - to taste
chopped basil leaves

Place the beef slices with the marinade ingredients in a zippered plastic bag and let them marinate overnight. Then just before serving fry, broil or barbecue them to desired doneness.
Blend the sauce ingredients and serve it with the meat, accompanied with rice. Sprinkle it with fresh. chopped basil leaves. I served the chopped basil on the side in a small bowl, and I also added grated zucchini as a side dish, sauteed with garlic in a bit of olive oil, lemon juice, salt and pepper.