Ingredients
- 1/2 cup chopped mixed green and black olives
- 1 tablespoon chopped capers
- 3 tablespoons chopped giardiniera (Italian-style pickled vegetables)
- 2 teaspoons red wine vinegar
- 1/4 cup extra-virgin olive oil
- Kosher salt and freshly ground black pepper
- 18 ounces freshly ground chuck
- 1/4 pound sliced spicy capicola or ham
- 1/4 pound sliced mortadella or bologna
- 1/4 pound sliced pepperoni or salami
- 1/4 pound sliced sharp provolone cheese
- 4 hearty burger buns
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