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)