Maine Lobster Croissant Toastie

Name: Maine Lobster Croissant Toastie
Ingredients: 8 ounces bacon (about 8 slices); 1 onion; 1 garlic clove; 3 tablespoons cider vinegar 3 tablespoons light brown; sugar; 4 1/2 teaspoons maple syrup; 6 ounces cooked lobster meat (coarsely chopped); 2 tablespoons mayonnaise; 2 tablespoons crème fraîche; 1 tablespoon chopped chives Kosher salt and freshly ground black pepper (to taste); 2 large croissants; 1/4 cup bacon jam; 4 slices pre-cut fresh mozzarella log (should be around 1/4-inch thick); 1/2 cup arugula