For mac and cheese filling
5 slices thick-cut bacon, cut into 1-inch pieces
4 cups dried macaroni
4 tablespoons of butter (1/2 a stick)
4 tablespoons flour
2.5 cups heavy cream
2 teaspoons 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 tablespoon brown sugar