Pressed Italian Tuna Sandwich

Ingredients

6 artichoke hearts, steamed and quartered or 1 (14-ounce) can artichoke hearts, drained
3 plum tomatoes, chopped
1/4 cup pitted and chopped black olives
1/4 cup small diced red onions
2 tablespoons chopped parsley leaves
1 tablespoon chopped marjoram
1 lemon, juiced
Salt
Freshly ground black pepper
1 (6-ounce) can Italian oil packed tuna, drained
Extra-virgin olive oil
1 loaf foccacia, split in 1/2 lengthwise
4 tablespoons unsalted butter
4 slices provolone or mozzarella, optional

Combine artichokes, tomatoes, olives, red onions, parsley, marjoram, and lemon juice. Season with salt and pepper and mix well. Add the tuna and mix well, being careful not to break it up too much. Lay the cheese on top, if using. Drizzle with olive oil and season.
Spread the tuna mixture onto the bottom half of the bread. Top with the upper portion of the bread, press down firmly and cut into sandwich sized pieces. Brush the outside of the bread with olive oil.
Have a large, cast iron skillet or a large griddle heated. Have a smaller cast iron skillet heating on the stove. Place the sandwich on the griddle or in the larger cast iron skillet. Top with the other hot skillet and cook just until both sides are golden brown and toasted. Slice and serve.