Open the sardines and optionally season with salt and pepper.
Dissolve the flour in water and add 1 egg. Mix it together.
Lightly coat the sardines in flour, dip in the batter, and then cover with panko.
Don't fry them right away. Let them sit awhile. Once the panko has become moist, then fry them! They will be so crispy!
Story Behind this Recipe
If you only use egg, the panko and the coating don't stick to the fish as well. Plus when you need to make a lot, one egg just isn't enough... But with this recipe, you can use just 1 egg and still make a lot. Plus the panko sticks very easily.
Dissolve the flour in water so that it's pretty thick. When mixing with the egg, if you feel that there's not enough, adjust with a little bit more watered down flour.