Bittersweet Chocolate Tart With Salted Caramelized Pistachios

Ingredients

• 4 oz. (8 tbs.) unsalted butter, melted
• 1/4 cup granulated sugar
• 1 tsp. finely grated orange zest
• 3/4 tsp. pure vanilla extract
• 1/8 tsp. table salt
• 4-1/2 oz. (1 cup) unbleached all-purpose flour
• 1 cup half-and-half
• 2 tbs. granulated sugar
• pinch table salt
• 7 oz. semisweet chocolate (up to 64% cacao), coarsely chopped
• 1 large egg, lightly beaten
• 1 recipe salted caramelized pistachios
• fleur de sel or other flaky sea salt