Start by cutting off the top of the baguette, then remove the crumb and press down on the inside of the bread. Fill it with the teaspoons of ketchup and spread.
Cut the cheese into thick slices and fill the bread with these slices. Set aside.
Cut the cooked ham slices in half.
Cut the onion and the bell pepper into thin strips.
Also cut the salami into thin round slices.
Now, stuff the bread with the pieces of ham, the onion strips, the bell pepper strips, and the salami round slices.
Add another 100g of grated mozzarella cheese, top it all with the round slices of tomato, and sprinkle oregano to taste.
Transfer the stuffed bread to a baking tray lined with nonstick baking paper.
Take to a preheated oven at 180°C (356°F) and bake for 15 minutes.
Serve.