Lentil Burger

Ingredients (20)

• 1-1/2 cups old-fashioned oats
• 6 medium fresh mushrooms, stems removed
• 1 shallot, quartered
• 1 small carrot, grated
• 3 garlic cloves, minced
• 1 cup cooked lentils
• 1 tablespoon maple syrup
• 1 tablespoon tomato paste
• 1 tablespoon spicy brown mustard
• 1 teaspoon kosher salt
• 1/2 teaspoon dried marjoram
• 1/4 teaspoon pepper
• 1/4 teaspoon crushed red pepper flakes
• 1/8 teaspoon garlic powder
• 2 tablespoons olive oil
• 2 tablespoons mayonnaise
• 2 tablespoons prepared mustard
• 2 tablespoons ketchup
• 6 hamburger buns, split
• Optional toppings: Fresh arugula, sliced tomato and sliced red onion