Ingredients:
- Aioli:
- 1/4 cup light mayonnaise
- 1/2 teaspoon fresh lemon juice
- 1 garlic clove, minced
- Burgers:
- 2 cups water
- 3/4 cup dried red lentils
- 3/4 teaspoon salt, divided
- Cooking spray
- 1 cup diced onion
- 1/2 cup finely diced carrot
- 3 garlic cloves, chopped
- 2 cups chopped mushrooms
- 1 teaspoon dried marjoram
- 1/4 teaspoon black pepper
- 3 tablespoons Madeira (optional)
- 1/3 cup dry breadcrumbs
- 1 tablespoon fresh lemon juice
- 2 large egg whites
- 1 tablespoon vegetable oil
- Remaining ingredients:
- 6 (1 1/2-ounce) hamburger buns
- Arugula or curly lettuce leaves
- 6 (1/4-inch-thick) slices tomato
- 6 (1/8-inch-thick) slices onion
