3 tablespoons unsalted butter, melted, plus more for greasing the dish 1/2 cup all-purpose flour 1/4 cup plus 2 tablespoons sugar Kosher salt 3 large eggs Finely grated zest of 1 lemon 1/4 cup plus 2 tablespoons milk 1 1/2 pints raspberries (3 cups) Powdered sugar, for dusting Preheat the oven to 350°F. Butter a 9-inch gratin dish. In a bowl, whisk the flour, sugar, and a pinch of salt. Whisk in the eggs, butter, and lemon zest until smooth. Add the milk and whisk until light
