MARINADE:

Juice of 1/2 lemon
Juice of 1/2 lime
3 green chilies, chopped
3 cloves garlic, chopped
3 tbsp. vegetable oil
1/4 cracked pepper
1 tbsp. white wine
Worcestershire sauce

SAUCE:

1/2 c. sour cream
1/4 c. mayonnaise
1/4 tsp. tarragon leaves
2 tsp. horseradish

Mix marinade and marinate steak in refrigerator for 6 hours. Blend sauce ingredients and refrigerate until use.

Grill steaks to desired doneness, basting occasionally with marinade. Serve with tarragon sauce and garnish with grilled tomatoes and lemon and lime wedges.