Homemade English Muffins
It's best to weigh flour due to inconsistencies in measuring by volume, but if you want to use measuring cups, 21 ounces is 4 1/2 cups.
You can also dust the muffins with farina or polenta instead of semolina.
For a cinnamon raisin addition, add 1 tablespoon ground cinnamon, 1 cup raisins, and reduce the amount of salt to 1 1/4 teaspoons.
Use a fork to split the muffins, not a knife to cut; fork-split muffins have the wonderful nooks and crannies.
You can place the dough into a bread machine on the Dough cycle instead of kneading and letting rise until doubled in size.