1. Peel and thinly slice the onions. Put in the slow cooker and toss with the olive oil. Cover and cook for 9-10 hours on high. 2. Add the broths and wine/marsala, if using; add no water or salt. Cover and continue to cook on high until hot, 15-30 minutes. 3. Serve with garlic bread or french bread topped with melted gruyere cheese. ---------------------------------------------------------------------------
Nutrition
Ingredients