Sweet Tart Dough

Sweet tart dough, or pâte sucrée, is very different from the dough of the previous tarts in this chapter. It is sweet, soft, and almost crumbly instead of crisp and flaky. I use this dough for dessert tarts baked in tart pans with removable bottoms. The pastry is often prebaked so that it will stay crisp when baked with liquid fillings. Some of my favorite tarts of this kind are lemon curd, almond, and chocolate. Though made from flour and butter, sweet tart dough has the additions of egg and sugar. The ingredients are combined in a process closer to making cookie dough than to that of pastry. In fact, this dough makes delicious thumbprint cookies, little rounds with depressions made by the baker’s thumb and filled with lemon curd or jam. Sweet tart dough is soft and tender for a number of reasons. First, the butter and sugar are creamed (mixed until soft and fluffy) so that they combine thoroughly with the flour, inhibiting the gluten and tenderizing the dough. Finally, the dough is moistened with an egg yolk instead of water, making it even more difficult for the gluten to activate. Nevertheless, the dough can be overworked, so the egg is mixed into the butter to distribute it evenly before the flour is added. Soften the butter for 15 minutes at room temperature before creaming. It needs to be soft enough to stir in the egg yolk, but not so soft that it will melt into the flour and make the pastry oily. Beat the butter until it is soft and fluffy with a wooden spoon (or use a mixer) and then beat in the sugar. Add the egg yolk and vanilla and mix until completely combined. The yolk will be much easier to mix in if it is at room temperature. A cold egg will harden the butter around it. (If your egg is cold, put it in a bowl of warm water for a few minutes before separating it.) Mix in the flour, folding and stirring it into the butter-egg mixture. Don’t leave any floury patches in the dough or the pastry will be crackled in these places. The dough will be soft and sticky (sugar makes dough sticky) and needs to be refrigerated for at least 4 hours to firm up before rolling. Gather the dough into a ball and wrap in plastic. Flatten into a disk and chill. The dough can be made and kept in the refrigerator for 2 days or in the freezer for up to 2 months. Let it thaw overnight in the refrigerator before using. When ready to roll out the dough, take it out of the refrigerator. If it is quite hard, let it sit about 20 minutes to soften. Because the dough is soft and sticky by nature, it is much easier to roll out between 2 sheets of parchment or waxed paper. Cut two 14-inch-square pieces. Flour the bottom piece and center the unwrapped dough on it. Dust the top of the dough with flour and place the other sheet of paper on top. Roll the dough, from the center out, into a 12-inch circle. If the dough sticks to the paper, peel back the paper and dust the dough with a bit more flour. Replace the paper, turn the whole package over, and repeat the dusting on the other side. If the dough gets too soft while rolling, put it on a baking sheet, paper and all, and chill it in the freezer for a few minutes to firm it up. Continue rolling, flouring when needed, until the dough is about 1/8 inch thick. Let the rolled pastry rest for a few minutes in the refrigerator before using. A 12-inch circle of dough will line a 9-inch tart pan. (A tart pan with a removable bottom will make unmolding the tart much easier once it is baked.) Peel the paper off the circle of dough and, if it is to be baked blind (or empty), lightly prick it all over with a fork. This process is called docking, and it allows the escape of air that otherwise might cause the pastry to bubble up while baking. Invert the dough over the tart pan and remove the other piece of paper. Press the dough gently into the edges. Cut off the excess dough by rubbing your thumb across the top edge of the pan in an outward direction. Press the sides in and up after tri...