Vegan Burgers

Name: Vegan Burgers
Prep time: 15 min
Cook time: 45 min
Total time: 45 min
Yield: 10 portions
Ingredients: 35 g flaxseeds; 75 g walnuts; 60 g onions; 2 garlic cloves; 30 g cooking oil; 225 g fresh button mushrooms; 225 g fresh brown mushrooms; 325 g cooked rice; 175 g canned lentils; 60 g panko breadcrumbs; 30 g balsamic vinegar; 30 g light soy sauce; ½ tsp paprika; 1 tsp salt; ½ tsp ground black pepper; 8 - 10 burger buns; vegan mayonnaise; Dijon mustard; 8 - 10 lettuce leaves; 2 tomatoes; tomato ketchup