Slow Cooker (Sweet, Dark and Dreamy) Caramelized Onions

Memorable, these onions, just thin slices of onion cooked til soft and dark and sweet in the slow cooker. My recipe is "extra-special" (I think! I hope you'll agree!) thanks to a little brown sugar and a little dry sherry and now "extra-easy" too thanks to the slow cooker. “Do you still make your three-hour onions?” asked my cousin’s wife Sue when she and Jerry