Place a small skillet over medium high heat. Once hot, add the chopped pistachios and cook, stirring constantly, until golden and fragrant. Remove from heat and wipe the skillet clean.
Cut the Kasseri cheese into 2-3 inch long, 2/3 inch thick slices. Spread the flour on a plate. Pour the cold water into a bowl. Dip each cheese slice into the water, then coat with flour.
Place the small skillet back over medium high heat and add 1 tablespoon of the olive oil. Once heated, add a slice of the floured Kasseri and fry until golden, 1-2 minutes per side. Remove to serving plate and repeat with remaining slices, adding more oil as needed.
Drizzle the fried slices with honey, sprinkle with toasted pistachios, and serve immediately.