A good slather of Dijon mustard on the puff pastry base adds a punchy counterpoint to the
sweet caramelized onions and salty cheese topping of this tart. Serve slices as an appetizer for
entertaining, or larger pieces with a green salad for a light lunch. The tart bakes up quite
beautifully, and will no doubt impress those lucky enough to try a slice.
Recipes, cookbooks, tips and how-to videos using mustard
