Lightly toast the two halves of bread and then on the lower half spread a good dollop of the sauce, top with lettuce and strips of bell pepper. Take the trouble to roast and skin the pepper before, it is always worth it.
Fry the onion and pancetta together while heating up your griddle pan. When good and hot, toss on your steak (lightly pre-salted with coarse salt) and cook for about 1 1/2 minutes – depending on your cut and personal preference.
When cooked to your liking, layer the ham, bacon and onion mix, tomatoes, sliced boiled egg and cheese on top of the meat. Cover with a lid for the remaining cooking time (roughly another minute) to allow the cheese to melt.
Carefully remove this pile of joy from the griddle pan and assemble your sandwich. Now figure out how to get it into your mouth. Enjoy.
Alternatively, you can cook the steak alone and then build up the layers on the bread. Place the completed sandwich - without the top - under the broiler (oven grill) until the cheese melts to your satisfaction.