Vegan burgers

Name: Vegan burgers
Prep time: 15 min
Cook time: 45 min
Total time: 45 min
Yield: 6 portions
Ingredients: 25 g linseeds (flaxseeds); 50 g shelled walnuts; 140 g fresh portobello mushrooms; 140 g fresh Swiss brown mushrooms; ½ brown onion; 2 garlic cloves; 20 g extra virgin olive oil; 120 g cooked rice; &frac23; can cannellini beans; 30 g panko breadcrumbs; 20 g balsamic vinegar; 20 g tamari; &frac13; tsp smoked paprika; &frac23; tsp sea salt; &frac13; tsp ground black pepper; 4 - 6 hamburger buns; vegan mayonnaise; mustard; 4 - 6 leaves letucce; 2 tomatoes; ketchup