Makes 18 doughnuts:• 2 (.25 ounce) envelopes active dry yeast• 1/4 cup warm water (105 to 115 degrees)• 1 1/2 cups lukewarm milk• 1/2 cup white sugar• 1 teaspoon salt• 2 eggs• 1/3 cup shortening• 5 cups all-purpose flour• 1 quart vegetable oil for frying• • 1/3 cup butter• 2 cups confectioners' sugar• 1 1/2 teaspoons vanilla• 4 tablespoons hot water or as needed 1. Sprinkle the yeast over the warm water, and let stand for 5 minutes, or until foamy.2. In a large bowl, mix together the yeast mixture, milk, sugar, salt, eggs, shortening, and 2 cups of the flour. Mix for a few minutes at low