Whisk together yogurt, salt, all spice or ground pepper and water. Slice the breasts if they are too thick. Place them in the buttermilk and rest for a minimum of 4 hours to overnight in the refrigerator.
Mix together little salt, red chili powder and flour. Keep aside. Beat egg with 2 tbsp water. Keep aside.
Remove the chicken and place them in the flour and coat them well. Dip in the egg mixture and then roll in the bread crumbs. Rest for 10 mins.
Deep fry in hot oil on a medium high heat until golden and crisp. Your meat thermometer should read 165F in the thickest part. Remove to a cooling rack. Fry the chicken in batches.
Slice and toast the dinner rolls on a griddle. Place the fried chicken, then lettuce and tomato.
Prepare a sauce by stirring mayo, mustard, olive oil, pepper, salt and lemon juice.
Add this generously over the tomatoes. You can also add tomato ketchup or any other preferred sauce. Place the other half of the dinner roll.