Place the ham bone, water, peppercorns, bay leaves and garlic in slow cooker. Cook on LOW for 6-7 hours (or overnight) or HIGH for 3.5 hours.

Cook bacon in a large skillet over medium heat. Remove to plate. Remove some of the grease from the pan, then add chopped onion, celery, zucchini, carrots, and potato and sauté for a few minutes.

Remove ham bone and remove any meat from it. Add ham, sautéed veggies, bacon, and remaining ingredients to broth in the slow cooker. Taste and add seasonings, as needed. Cook on LOW for 2 more hours, or until potatoes are tender.