Chop olives, giardinera, and pepperoncini, mix together in a large bowl. Add parsley, oregano, and garlic, stir well. Add black pepper to taste. Stir in olive oil, pack mixture into glass jars, refrigerate.
Allow to chill for at least 24 hours before using.
Slice loaf of bread in half horizontally. Scoop out a bit of the bread inside (I like to freeze it to make stuffing with at a later date!). This allows room for all of the meats, cheeses, and salad you’ll be stuffing the sandwich with.
If the oil in your olive salad has solidified, warm up about 2 cups of salad in the microwave, just until oil has liquified. Drizzle some of the salad oil on cut side of both halves of the loaf, and spread with olive salad. Use as much / little of the ~ 2 cups as you want.
Layer meats and cheeses on the bottom half of the loaf to construct the sandwich – I like to alternate meats and cheeses, but feel free to go your own way with it. Carefully cover with the top half of the loaf. Wrap tightly with plastic wrap, chill for 30 minutes.
To serve, unwrap and cut into wedges. Serves 6-8+ people, depending on appetite!