Foryoueats: Homemade Vegan Burgers

Ingredients

• 1 1/2 pounds button mushrooms, trimmed
• 1/4 cup canola or vegetable oil
• Kosher salt and freshly ground black pepper
• 6 thyme sprigs
• 1 whole small eggplant (about 1/2 pound)
• 2 large leeks, chopped fine (about 1 1/2 cups)
• 1 large celery rib, chopped fine (about 1/2 cup)
• 1 medium clove garlic, grated on a microplane grater (about 1 teaspoon)
• 3/4 cup dry pearl barley
• 1 (14-ounce) can garbanzo beans, drained and patted dry on paper towels
• 1/4 cup all-purpose flour
• 2 teaspoons baking powder
• 1 teaspoon marmite, vegemite, or Maggi seasoning
• 1 cup toasted cashews, pinenuts, or a mix
• 1 teaspoon soy sauce
• 1 1/2-cups panko-style bread crumbs (see note)