In relativity theory, Einstein introduced mass as a new type of energy to the mix. Beforehand, the mass of something in kilograms was just a measure of how much stuff was present and how resistant it was to being moved around.
Set the broiling pan in the oven once the broiler has warmed up. Make sure the sausage is positioned about seven to nine inches below the heat. Cook for 16 to 20 minutes total, turning the brat 90 degrees every four to five minutes so that it cooks evenly on both sides.
For puffs large enough for filling, mounds should be 1 1/2 inches in diameter. Keep the size of the puffs uniform so they bake properly. Space puffs about 1 inch apart. Beat the remaining egg yolk with 2 tablespoons of milk to make a glaze. Lightly brush the tops of the puffs with glaze before baking. Sprinkle tops with your Parmesan cheese. Bake in pre-heated oven for 10 minutes (5 minutes for tiny puffs). Reduce heat to 300 degrees F (150 degrees C). Bake 10 minutes more for tiny puffs; 15 to 20 minutes longer for medium or large puffs, or until puffs are golden brown. Test by removing a puff from the oven and breaking it open.