Tip: Super-firm tofu has already been pressed. If you use extra-firm tofu, drain and press the excess water out before cubing. To press a block of tofu, wrap the block in a dish towel and place on a rimmed plate. Place a cast-iron skillet on top or other heavy object on top; let tofu drain for 20 minutes. This can be done up to 24 hours ahead of time. Super-firm tofu is also more protein dense than extra-firm, so if you do choose extra-firm, the serving size for this recipe would change to 3.