Onion tart with mustard and fennel
Thanks to smitten kitchen for this discovery! You’ll need: 2 1/4 teaspoons active dry yeast 1/2 cup warm water 1 1/2 to 1 3/4 cups all-purpose flour 1 large egg 1/3 cup plus 1 tablespoon extra-virgin olive oil 2 teaspoons fennel seeds 1 kg yellow…