Peel and grate potatoes into a mixing bowl. Squeeze out liquid.
Peel and grate onion into potatoes. Add eggs, flour, and salt and stir to make a smooth batter that will drop heavily from the spoon.
Put the shortening or oil in a heavy frying pan using enough to cover the pancakes amply. Drop the batter from a spoon into the hot shortening, making pancakes 3 inches in diameter. Fry over moderate heat until brown on the underside, turn to brown the other side.
Lift out and drain off excess fat on paper towel. Pancakes fried in deep fat should be puffed and crisp.
These pancakes may also be baked in a shallow baking pan for 45 minutes at 350°F until nicely browned. Cut into squares and serve hot. They may also be put into a well greased small muffin pan and baked 45 minutes at 350F.