Inspired by the sandwiches at TigerTiger, this herbaceous tofu marinade is irresistible. Fresh ginger and lemongrass excite the senses, and soy sauce adds a salty, Asian-inspired kick. Make sure the tofu is extra-firm, as softer consistencies will collapse and not be able to hold up in a sandwich. Find this blend of fennel, star anise, cinnamon, cloves, and ginger with the spices at well-stocked grocery stores. Cut, marinate, and chill tofu up to a day ahead, keeping chilled and covered the entire time.
Cut tofu into 7 or 8 slices, each 1/2 in. thick and about 2 by 4 in. wide, and set in a 9- by 13-in. dish. In a food processor, whirl lemongrass, ginger, and garlic to mince. Add 2 tbsp. water and remaining ingredients; whirl to blend. Spoon marinade over tofu and turn to coat, distributing seasonings. Chill, covered, at least 3 hours, turning occasionally.
Preheat oven to 450°. Set tofu on an oiled baking sheet, brushing off seasonings with fingers. Bake tofu until browned and a little crisp, 25 to 30 minutes.
*Find this blend of fennel, star anise, cinnamon, cloves, and ginger with the spices at well-stocked grocery stores.