Preheat oven to 400F; prepare a baking sheet by either oiling it lightly or lining it with a silicone liner.
Cut the tofu into 8 1/2-inch slices and dry them lightly with paper towels. Brush both sides of the tofu with the 2 tablespoons soy sauce and set aside to marinate for at least 10 minutes.
While the tofu is marinating, place the bread into the food processor and pulse into fine crumbs. Measure out 1 cup of crumbs into a wide, shallow bowl. (Save any remaining crumbs for another use.) Pulse the pistachios in the processor until they are reduced to fine crumbs. Add them to the bread crumbs along with a generous grating of black pepper, and mix well.
In another shallow bowl, combine the mustard, syrup, soy sauce, and mayo.
Dip a slice of tofu into the mustard mixture, lightly coating all sides; then place it into the bread crumbs, sprinkle crumbs over the top and sides, and lightly press them into the tofu. Place on the prepared baking sheet. Repeat with all slices of tofu.
Put the tofu into the oven and bake for 20 minutes, or until bread crumbs are golden brown. Serve with the sauce of your choice, such as the Easy Sweet and Sour Sauce below.