1thick square slice of kefalotyri or other hard cheesesee above around 4 x 4 inches (11 x 11 cm). Thickness must be at least 2/3 of an inch or 1 ½ cm. If it is thinner, it will melt.
Lemon for serving
Take the slice of cheese and dip it in cold water, then in white flour, shaking to remove excess and smoothing it with your fingers.
Heat 1 tablespoon of olive oil in a small pan under medium heat. Once hot, place the cheese in the pan and fry for about 2 minutes than flip carefully (I use a thin rubber spatula). Be careful not to let the crust slide off. Fry on the other side for about 2 minutes. The crust should be golden.
Remove from pan and place on a plate, squeeze some lemon over it and serve right away.