Take 4 slices of bread, lay flat and place the thin slices of mozzarella on top. Make sure that the cheese slices are trimmed to stay within the bread slices.
Cover with the remaining 4 slices of bread; so essentially 4 sandwiches with thin slices of cheese in between.
Dip the edges of the sandwich in flour and then use water to press the edges firmly gluing it together. Make sure that the edges are sealed well and tight.
Beat the eggs in a bowl and season with salt and pepper.
Place the sandwiches in a deep bowl and pour half the egg mixture on top making sure the surface is coated well. Keep aside for 10 minutes.
Turn the bread slices over carefully and pour the remaining egg mixture; let sit for another 10 minutes.
Heat enough oil for deep frying in a pan and fry the sandwiches, one at a time, till golden brown and crisp.
Place on paper towels to drain excess oil.
Garnish with chilli oil and dill leaves.