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["Preheat the oven to 375 F", "Using a spatula, mix together the melted butter and sugar in a medium bowl.", "Add the flour and salt and stir until the dough comes together and the flour is entirely incorporated.", "Transfer the dough to a 9"" springform pan and press it evenly into the pan with your fingertips, pushing up the sides to be about 1.5 inches high. Prick the bottom of the crust all over with a fork.", "Bake the crust until it is golden, for about 18 minutes. Remove from oven and set aside to cool in pan.", "Reduce the oven temperature to 350 F. Prepare the buttermilk custard while the crust is cooling.", "For the buttermilk custard: Add buttermilk, eggs, yolk, butter, 2/3 cup brown sugar, flour and salt to food processor. Process until combined and the mixture is smooth.", "Pour custard into tart shell and bake at 350 F for about 35-40 minutes, until the filling puffs and the center is almost set, but jiggles slightly when shaken gently.", "Set the tart aside to cool while you prepare the citrus topping.", "For the citrus brulee: Cut away the pith and skin from the grapefruit and the blood oranges, leaving the flesh exposed. Slice the fruit along its width into circular slices 1/8"" thick. If necessary, remove any seeds or inner white pith. Gently pat the citrus slices dry with a paper towel to remove any excess juice.", "Arrange the citrus slices in an alternating pattern over the top of the tart.", "Grind the star anise in a spice grinder (or with a mortar and pestle) until finely ground. Add the 1/4 cup of brown sugar and grind for 5-10 more seconds, until well blended.", "Sprinkle the sugar mixture over the citrus and melt the sugar by using a blowtorch, or by placing the tart under the broiler for 2-3 minutes.", "Carefully remove the tart from the pan and serve."]
