Bacon Mac 'N' Cheese Pie with Bacon Lattice

INGREDIENTS

For the crust

3 1/2 cups

all-purpose flour (from the freezer if possible)

1 cup

very cold unsalted butter, cut into ½" cubes

1/4 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

slices thick-cut bacon, cut into 1-inch pieces

4 cups

dried macaroni

4 tbsp

butter (½ a stick)

4 tbsp

flour

2 1/2 cups

heavy cream

2 tsp

mustard powder

egg yolk

1 lb

grated cheese — an equal parts mixture of gruyere, sharp cheddar, brie (no rind)

Kosher salt and freshly ground black pepper

For the bacon lattice

slices bacon

1 tbsp

brown sugar