Donuts
3 (1/4 ounce / 7g) packages yeast (3/4 oz / 21g total) - I used "Rapid Rise" but traditional is fine too - it just affects the rising times
1/2 cup (120ml) water (105-115F / 40-46C)
2 1/4 cups (530ml) milk, scalded, then cooled
3/4 cup (169g) sugar
1 1/2 teaspoons salt
3 eggs
1/2 cup (113g) shortening
7 1/2 cups (940g) all-purpose flour
canola oil for frying

Glaze
1/2 cup (113g) butter
3 cups (375g) powdered sugar
2 1/4 teaspoons vanilla
6 -9 tablespoons (90-135ml) evaporated milk (can substitute regular milk or water for milder flavor)