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Rich Caramelized Onion Tart With Fennel

onion tart with mustard and fennel
Caramelized onions aren’t just good for making soup! Next time you make a batch, use the golden brown onions as a topping for a fennel-spiced tart.

What You’ll Need

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  • warm water (105 to 115°F) ( 1/2 cup )
  • Dijon mustard (I use a bit more) ( 1 tablespoon )
  • grated Parmigiano-Reggiano (I like it coarsely grated for this) ( 1/2 cup )
  • active dry yeast (a 1/4-ounce package) ( 2 1/4 teaspoons )
  • salt, divided ( 2 1/2 teaspoons )
  • large egg ( 1 )
  • extra-virgin olive oil, divided ( 1/3 cup plus 1 tablespoon )
  • yellow onions, halved and thinly sliced ( 3 pounds )
  • all-purpose flour ( 1 1/2 to 1 3/4 cups )
  • fennel seeds ( 2 teaspoons )
Ready to make? Find out how onsmitten kitchen