Mom's Perfect Sub Sandwich

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3 tablespoons extra-virgin olive oil

3 tablespoons red wine vinegar 

Kosher salt and freshly ground black pepper 

Four 6-inch ciabatta rolls 

1/2 teaspoon dried oregano 

1/4 pound thinly sliced prosciutto 

1/4 pound thinly sliced capicola (preferably hot) 

4 ounces thinly sliced Genoa salami 

1/3 pound thinly sliced provolone

2 plum tomatoes, very thinly sliced 

1 1/2 cups shredded lettuce 

1/2 red onion, very thinly sliced 

4 pickled pepperoncini, thinly sliced 

Fresh basil leaves, cut into thin strips (optional)