Umami Bomb Mushroom Burgers

Bahan-bahan (6 porsi)

• 1 pound hulled barley, cooked
• Oil
• 1 large onion, diced
• 4 g arlic cloves, chopped
• 1 pound cremini mushrooms, rinsed and roughly chopped
• 4 ounces shiitake mushrooms, rinsed and roughly chopped
• 5 sun-dried tomatoes, roughly chopped
• 1/4 cup parmesan cheese, grated
• 2 tablespoons chopped fresh herbs, such as thyme, rosemary, and/or parsley
• 1 teaspoon soy sauce
• 1/2 teaspoon marmite
• 1/2 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 2 large eggs
• 2 1/2 cups panko bread crumbs, or as needed
• Buns
• Avocado ribbons, see note
• Sliced red onion
• Radish sprouts