Pastitsio Burgers

Ingredients

• 1 small onion, finely chopped
• 2 cloves garlic, finely chopped
• 1/2 pound 85% lean ground beef
• 1 pound lean ground lamb
• fine salt and freshly ground pepper to taste
• 2 tablespoons tomato paste
• 1/2 teaspoon dried oregano
• 1/4 teaspoon ground cinnamon
• 3 tablespoons finely chopped flat-leaf parsley
• Kefalotiri cheese to melt on top if you like