Basic Veggie Burger

Name: Basic Veggie Burger
Ingredients: 10 1/2 ounces 300 g roughly chopped sautéed mushrooms, eggplant, onions, or beets, plus more as needed; 1 1/3 cups 298 g drained and rinsed canned beans or lentils, mashed with a fork, plus more as needed; About 1/3 cup 2 1/2 ounces, or 70 g cooked brown rice, bulgur, or freekeh, plus more as needed; About 1/4 cup 40 g rolled oats or other flakes, plus more as needed; 3 cloves garlic crushed; 2 tablespoons 8 g nutritional yeast or grated Parmesan cheese; 2 tablespoons 30 ml soy sauce or tamari; 3/4 teaspoon salt plus more to taste; 1/4 teaspoon freshly ground black pepper plus more to taste; Herbs spices, cheeses, or other defining tastes (optional); Olive oil or ghee for frying; 4 buns halved and lightly toasted