Lettuce Burger with Tahini Aioli

Ingredients

• 16 oz organic grass-fed beef
• 1 head of butter lettuce, leaves separated
• 1/2 red onion, half sliced and half finely chopped
• 2 tomatoes, sliced
• 1 avocado, sliced
• 1 teaspoon red pepper flakes
• 1 teaspoon onion powder
• 1 teaspoon chili powder
• Salt
• pepper
• 3 tablespoons oil (for cooking)
• 1/2 cup tahini
• Juice of 1 lemon
• 3 tablespoons chopped fresh parsley
• 6 garlic cloves, minced
• 1 teaspoon olive oil (for sautéing garlic)