Greek Feta Burger

INGREDIENTS

• 1/2 teaspoon salt
• 1/2 clove garlic, crushed to a paste
• Vegetable oil cooking spray
• 1/3 cup finely diced red onion
• 6 ounces nonfat plain Greek yogurt
• Sliced cucumber (optional)
• 1/4 teaspoon freshly ground black pepper
• 1/2 teaspoon dried marjoram
• 1 pound lean ground beef (93 percent or 95 percent lean)
• 1 jar (7 ounces) roasted red peppers, drained
• Shredded romaine (optional)
• 1/2 cup crumbled reduced-fat feta
• 4 ounces hothouse cucumbers (unpeeled), coarsely grated (about 1/2 cup)
• 4 ounces zucchini, finely diced (about 1 cup)
• 4 sourdough rolls, split
• 1 teaspoon fresh lemon juice