French Onion Cheese Fondue You heard it here first: three-cheese fondue is even better when you add deeply caramelized onions to the mix. Fontina, butterkase, and shredded grand cru cheese work together to make this the gooey dip of your dreams. Just add warm pretzel bites for best results. Get the recipe: french onion cheese fondue Image Source: Foxes Love Lemons