1) Line a large plate with paper towels and set aside.
2) Combine the flour and water in a medium bowl and mix well.
3) Add the buffalo wing sauce and mix again
4) In another bowl combine the panko bread crumbs and chopped pistachios and toss well
5) Place about 1/3 cup of the panko and pistachio mixture on a small plate
6) Heat 1/4 cup of oil in a small skillet
7) Dip a slice of tofu in the prepared Buffalo sauce batter until well coated. Lift the tofu using 2 forks and let the batter drip as much as possible
8) Place it on the small plate with the panko and pistachio mixture. Spoon some of it on top of the tofu, pressing slightly so the tofu is well coated
9) Repeat the process until all the tofu slices are breaded, adding more bread crumb-pistachio mixture to the small plate for each slice of tofu (by doing this, the tofu will be easier to coat)
10) Once the oil is hot, lower the heat to medium and fry the tofu for about one minute per side or until golden. Add more oil to the skillet if needed.
12) Transfer each slice to the lined plate and serve immediately