Vegan Burgers

Name: Vegan Burgers
Prep time: 15 min
Cook time: 45 min
Total time: 45 min
Yield: 8 portions
Ingredients: 35 g linseeds; 75 g halved walnuts; 60 g onion; 2 garlic cloves; 30 g olive oil; 225 g fresh button mushrooms; 225 g chestnut mushrooms; 325 g white rice; 175 g ready-to-eat Puy lentils; 60 g panko breadcrumbs; 30 g balsamic vinegar; 30 g soy sauce; ½ tsp paprika; 1 tsp fine sea salt; ½ tsp ground black pepper; olive oil; 8 hamburger buns; 8 Tbsp mayonnaise; 8 tsp American mustard; 8 green lettuce leaves; 2 ripe tomatoes; 8 Tbsp ketchup