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Wash and dry produce.
Trim and thinly slice mushrooms (skip if your mushrooms are pre-sliced!). Halve, peel, and cut onion into 1-inch-thick wedges. Peel and mince or grate garlic. Roughly chop cilantro. Quarter lemon.
Open and drain tofu; press out excess water with paper towels. Halve crosswise, then stand tofu upright and halve vertically. Lay flat and cut into ¾-inch cubes. Season with salt and pepper.