Ingredients

• 1 cup plain low-fat yogurt
• 1/2 cup grated unpeeled English cucumber
• 1 clove garlic
• 1/4 teaspoon dried mint
• pinch salt
• pinch pepper
• 4 Greek-style pita breads warmed
• 2 cups shredded lettuce
• 2 small tomatoes
• 4 red onions

Meatballs:

• 1 egg
• 1/4 cup dry breadcrumbs
• 1 tablespoon Dijon mustard
• 1/2 teaspoon dried oregano
• 1/4 teaspoon salt
• 1/4 teaspoon pepper
• 1 lb lean ground beef