Put the ham bone, onion, carrots, celery, bay leaves, and peppercorns in a large oven-safe pot (mine's 14 quarts) and fill it with water. Cover.
1 HoneyBaked ham bone, Whatever's left of a bunch of celery, A handful of baby carrots, 1 onion, 2 to 3 bay leaves, A scatter of black peppercorns, Water