About 3 pounds of sweet onions
6 tablespoons butter, cut into pieces
About 1/4 teaspoon salt
Pinch of ground white pepper

Peel the onions and trim off the root and stem ends. Halve each onion lengthwise, then slice thinly (about 1/4 inch or thinner). Place the onions and butter into the insert of a slow cooker. Cover and cook on low for about 10 hours (I do this overnight), or until the onions are a deep golden brown and are very soft.

The onions will produce a lovely amount of liquid, which can be used to make a most wonderful Caramelized Sweet Onion Soup.