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1 medium onion, cut into chunks
2 garlic cloves
2 tablespoons sugar
1 tablespoon ground mustard
1/2 teaspoon ground ginger
1 1/2 teaspoons pepper
1/2 teaspoon cayenne pepper
1/2 cup soy sauce
1/4 cup water
2 pounds beef sirloin tip roast, cut into 1/4 inch thick slices
CUCUMBER SAUCE:
1 medium cucumber, peeled, seeded and cut into chunks
4 garlic cloves
1/2 teaspoon salt
1/3 cup cider vinegar
1/3 cup olive or vegetable oil
2 cups sour cream
8 pita breads, warmed and halved
thinly sliced onion
Chopped tomato
DIRECTIONS:
1. In a blender or food processor, place the onion, garlic, sugar, mustard, ginger, pepper and cayenne; cover and process until onion is finely chopped. Add soy sauce and water; process until blended. Place the beef in a large resealable plastic bag. Add marinade. Seal bag and turn to coat; refrigerate for 1-2 hours.
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I found this recipe here at All Recipes.com