finely chopped shallot (from 1 small shallot) • fresh lemon or lime juice or red or white wine vinegar, plus more as needed • Kosher salt • plus ½ cup extra-virgin olive oil • (14- to 16-ounce) block extra-firm tofu, sliced ½-inch thick and patted dry • finely chopped fresh parsley • finely chopped fresh cilantro, mint, dill, chives, chervil, celery leaves, fennel or carrot tops, or a mix • fresh thyme, oregano, marjoram or tarragon leaves (optional) • red-pepper flakes