Halve each bell peppers, seeded, wash clean and pat to dry, sprinkle with salt. Slice round the onion, and place all on a baking rack. Grill for 10 minutes, turn, and grill for another 10 minutes.
Slice the top of the loaf (as shown on picture, and set aside) and make a hollow center by cutting out the inside of the loaf, but leave an edge of around so the shell is not too thin.
Skin the grilled bell peppers.
Mix vinegar and minced garlic (and other ingredients if you use them), and brush generously the cavity of the loaf.
Line bell peppers, brush with seasoning, then line lunch meat, brush with seasoning again, then line grilled onion, and brush with seasoning as well. Repeat layers until all used up, each time brush with seasoning.
Place the top of the loaf back and wrap the whole with aluminum foil. Place in the fridge for whole night long.
Unwrap foil, slice into 4 servings, and enjoy :)