Scarlet Black Bean Burger - Meat Free Monday

Ingredients

• 2 tablespoons of oil for baking tray
• 1 medium beet, peeled and cut into 1-inch pieces, about 1 cup
• 2 medium carrots, peeled (or leave unpeeled) and cut into 1-inch pieces, about 1 cup
• 1 small onion, peeled, cut into chunks
• 140 g/5 oz white or cremini mushrooms (half of a standard 10-ounce package)
• 3 large cloves garlic, peeled
• 1 cup old fashioned oats
• ½ cup walnuts
• 2 teaspoons chili powder
• 2 teaspoons smoked paprika
• 1 teaspoon cumin
• 1 teaspoon salt
• 1 400 g (15.5-ounce) can black beans, drained and rinsed
• ½ cup vegan mayonnaise