Meatloaf:
1 tablespoon olive oil
1 small Spanish onion, minced
Salt
3 cloves garlic, minced
1 cup coarsely crushed soda crackers, such as Nabisco Saltine Crackers (about 24 crackers)
1/2 cup whole milk
1 tablespoon Dijon mustard
1 tablespoon Worcestershire sauce
1 teaspoon hot sauce
2 large eggs
Freshly cracked black pepper
1 pound ground beef chuck
8 ounces ground pork
8 ounces ground veal
1/3 cup chopped fresh parsley

Glaze:
1/2 cup ketchup
4 tablespoons brown sugar
4 tablespoons apple cider vinegar

Sandwich Build:
4 slices sharp Cheddar
4 potato rolls, buttered and toasted
Bread and butter pickles (3 to 5 per sandwich)
1 can crispy onions, such as French's French Fried Onions