Grilled Gyro Burgers
Ingredients:
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2 (8 ounce) containers plain yogurt, divided
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1 (1 ounce) package dry Ranch-style dressing mix
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1 cucumber, peeled, seeded, and chopped
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1 ½ pounds ground beef
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¼ cup diced onion
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6 pita bread rounds
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2 cups torn lettuce leaves
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1 tomato, seeded and diced