Bittersweet Chocolate Tart

INGREDIENTS

• Tart Shell:
• 1/2 cup + 1 T / 4.5 oz / 130g unsalted butter, room temperature
• 1/2 cup / 2.5 oz / 75g natural cane sugar, muscovado, or brown sugar, sifted
• 1/4 teaspoon fine grain sea salt
• 1 large egg, room temperature
• 1 3/4 cup / 8 oz / 225g whole wheat pastry flour
• Filling:
• scant cup / 225 ml heavy whipping cream
• 2 tablespoons milk
• 7 ounces / 200g 70% bittersweet chocolate, chopped
• 1 large egg, beaten
• flaky sea salt, cocoa powder
• equipment: two 9-inch tart pans (or equivalent).