Muffuletta sandwich with New Orleans olive spread

This MUFFULETTA SANDWICH is the most
famous sandwich in NEW ORLEANS.
Legend has it that the muffuletta sandwich was created in 1906 at the Central Grocery Co, in New Orleans, by the shop owner Salvatore Lupo, an Italian immigrant.
The traditional-style muffuletta sandwich consists of a focaccia split horizontally in two and covered with layers of chopped pickled vegetables, pickled olives, and topped with sliced ham, salami, mortadella, and sliced provolone cheese.

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Ingredients:
For 2 Muffuletta Sandwich
Ingredients for the filling: (olive salad)
2 homemade focaccia * or two bought round rolls
200 g of pickled pickled vegetables
100 g (1/2 cup) of green olives, pitted and coarsely chopped
100 g (1/2 cup) of black olives, pitted and coarsely chopped
6 chopped pickled pepperoncini
2 cloves of garlic, minced
1 chopped carrot
1 bunch of chopped celery
1 tablespoon of capers, drained and rinsed
1 pinch of dried oregano
1 pinch of dried basil
1 pinch of flaked pepper
1 pinch of salt and pepper to taste
4 tablespoons of olive oil, extra virgin
1-2 tablespoons of vinegar (optional)

Ingredients:
For the sliced meats
8 slices of cooked ham
8 slices of ​​salami
8 slices of ​​mortadella
8 slices of capicolla
8 ​​slices of provolone
see my homemade focaccia video