When you make classic French palmiers, you roll puff pastry dough in granulated sugar before shaping and baking it, resulting in pastries with a caramelized outer crust. The same technique works with pie dough (and rough puff pastry). Roll the dough in sugar before using it to line the pie plate, and it will caramelize on the outside during baking. This dough is best used the same day it’s made. The high oven temperature ensures the sugar melts, then caramelizes firm on the dough — don’t fret about it sticking to the pie plate, but take care not to overbake, as this crust is more prone to burning!