Bacon Mac 'N' Cheese Pie with Bacon Lattice

Inspired by Breakfast for Dessert and chef Matt Jennings' Cheesemonger's Mac and Cheese:

INGREDIENTS
For the crust
3½ cups all-purpose flour (from the freezer if possible)
1 cup (2 sticks) very cold unsalted butter, cut into ½" cubes
¼ cup cold vegetable shortening
1 Tbsp. plus 1 tsp sugar
1 Tbsp. kosher salt
1 Tbsp. scant apple cider vinegar + enough ice water to make ¾ cup liquid

For mac 'n' cheese filling
5 slices thick-cut bacon, cut into 1-inch pieces
4 cups dried macaroni
4 Tbsp. of butter (½ a stick)
4 Tbsp. flour
2.5 cups heavy cream 
2 tsp mustard powder
1 egg yolk
1 pound grated cheese — an equal parts mixture of gruyere, sharp cheddar, brie (no rind)
Kosher salt and freshly ground black pepper

For the bacon lattice
8 slices bacon
1 Tbsp. brown sugar

PREPARATION

For the crust
1. Measure out all of your ingredients for the crust and make sure your butter and shortening are very cold. (It helps to put them in the freezer after they're measured and cut into pieces. It also helps to keep the flour in the freezer.)

2. Put flour, butter, vegetable shortening, sugar, and salt in a food processor and pulse JUST until butter resembles tiny pebbles, about 12-15 times. (If you don't have a food processor, stir the dry ingredients then cut the fats into the mixture with the tines of a fork until you have tiny pebbles and it's pretty well incorporated.) Transfer to a large bowl. Gradually add vinegar-ice water mixture, using a fork to stir until dough is a mixture of clumpy wet pieces and sandy pieces, adding more water if dry. Take care not to over-moisten your dough — you don't have to use all ¾ cups liquid. Watch the dough and stop adding liquid once it begins to clump. It doesn't need to be completely stuck together.

3. Turn dough out onto a clean counter and form into ball. Be careful not to over-handle it — it doesn't need to be kneaded, just needs to come together. Once it's in a ball, cut the ball in half then flatten the halves into discs. Wrap each disc in plastic wrap and chill at least 1 hour or overnight. (DO AHEAD: Can be made ahead. Keep dough refrigerated up to 2 days, or enclose in resealable plastic bag and freeze up to 1 month, then thaw in refrigerator overnight. Soften slightly at room temperature before rolling out.)

4. Lightly grease a 9" pie plate with butter, shortening, or baking spray.

5. Prepare a clean countertop as workspace to roll out the dough. Sprinkle some flour on a sheet of parchment, put one dough disc on it, sprinkle flour on the disc, then top with another sheet of parchment. Using a rolling pin, roll out dough between those two sheets of parchment paper in a circular shape until its diameter is 2"-3" larger than the pie plate all around.

6. Remove the top sheet of parchment, then carefully pick up an edge of the round and wrap it around the rolling pin. As you continue to roll the pin, the dough will wrap completely around it so you can easily transfer it to the plate. Starting on one edge of the pie plate, unroll the dough, making sure it is centered. At this point it's best to put it back in the fridge for 30 minutes to 1 hour.