Feta & Tomato-Topped Greek Burgers

Ingredients

• 4 medium tomatoes, sliced
• 1 medium red onion, thinly sliced
• 1/3 cup pitted Greek olives, coarsely chopped
• 3 ounces feta cheese, cut into 1/2-inch cubes
• 3 tablespoons olive oil
• 2 tablespoons minced fresh basil
• 2 tablespoons minced fresh parsley
• 2 tablespoons white wine vinegar
• 1 teaspoon salt
• 1/2 teaspoon pepper
• BURGERS:
• 1/4 cup olive oil
• 1/4 cup dry red wine or beef broth
• 2 tablespoons red wine vinegar
• 1 tablespoon fresh thyme leaves
• 1 tablespoon snipped fresh rosemary leaves
• 2 garlic cloves, peeled
• 1/2 cup panko bread crumbs
• 1-1/2 teaspoons salt
• 1-3/4 pounds ground beef
• 1/4 pound ground lamb
• 6 whole pita breads, warmed