Red Onion Tart

By Syd

5.0 / 5

25min

35min

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1 (.25 ounce) package active dry yeast
1 pinch white sugar
½ cup warm water
1 egg at room temperature
3 tablespoons butter at room temperature
2 ½ cups all-purpose flour
1 teaspoon salt
2 teaspoons lemon zest
½ teaspoon vegetable oil
½ red onion sliced
1 cup shredded Gouda cheese
½ cup grated Parmesan cheese
2 jarred roasted piquillo peppers diced
¼ teaspoon ground black pepper to taste
2 eggs
1 ½ cups heavy cream
¼ teaspoon stone-ground mustard