In a bowl add boiled and shredded chicken
Now add black pepper, white pepper, white vinegar, mustard paste, and soya sauce
Mix them together very well set aside
In a pan add some oil/butter heat it then adds a chicken mixture
Stir to mix well for 2 minutes
Remove from the flame
Keep aside
In a small bowl add eggs,2 pinch salt, black peppercorn and milk
Whisk well keep aside
In a frying pan add little oil
Then pour half a mixture of egg
Cook from both sides
Repeat the same process with the remaining egg as well
Keep aside
Cut the edges of bread from all four sides
Grease grill pan with butter and
Then toast bread slices from both
For 1 sandwich arrange 4 slices
Spread mayonnaise on each slice
Put 3 tbsp chicken on slice then place bread slice on top of sandwich stuff
Then spread some mayo and place some slices of cucumber, tomato and lettuce leaves on top
Drizzle some tomato ketchup it's optional
Place another slice on top of it
Place some egg and cheese slices
Finally, place the last one bread slice
Press them slightly
Insert a toothpick to hold the sandwich
Carefully cut into halves
Serve !