Grate some chunks of the potato, alternating with the onion using a food processor. Place colander over a pot or bowl which will catch the liquid drippings. Place the grated onion and potato mixture in the colander and let stand. Press down on the mixture to hasten the draining process every 5 minutes or so. However, don't worry if the potato does discolor.
Taste is unaffected and somehow the right color returns during cooking.
Place the potato-onion mixture in a mixing bowl. Add all remaining ingredients except the cooking oil. At the bottom of the bowl, you will find a thick, starch paste. Use about 2 tablespoons of potato mixture for each pancake. Drop into skillet and flatten with spatula.