Ingredients

• 1 pound ground beef
• 1 pound ground lamb
• Salt and freshly ground black pepper
• 1 tablespoon grapeseed oil
• 4 slices feta, 1/4-inch thick
• 1/2 cup sour cream
• 1/4 cup peeled and small diced cucumber
• 2 tablespoons minced red onion
• 2 tablespoons diced tomato (excluding skin)
• 1 teaspoon salt
• 1 pinch ground white pepper
• 3 tablespoons softened butter
• 4 brioche buns
• Lettuce and tomato, for burger

Instructions

1. For the burgers: In a bowl, blend the beef and lamb. Sprinkle with salt and pepper, and then remove from the bowl and form 4 patties, 8 ounces each.
2. Next, to cook the burgers, warm a large pan with the oil over high heat until the verge of smoking. Then reduce the heat to medium and add the burgers. Cook on the first side for 5 minutes, and then flip and repeat the process on the second side. During the second side of cooking, top with the feta cheese and finish for final time.
3. For the sauce: During the burger cooking, in a bowl blend and whisk together the sour cream, cucumbers, onions, tomatoes, salt and pepper. Taste and add any additional seasoning if desired.
4. Warm a second pan over medium heat. Spread the butter on the interior of the buns, and then place in the warmed pan, browning until crusted, 2 to 3 minutes.
5. Once cooked, remove and build the burgers with lettuce, tomato, burger, and top with sauce and enjoy.