Grate onion. Put together in the top of a double
boiler and stir well. Then place the
boiler in a bowl of quite warm water.
Stirring and feeling with the finger to see that it gets to less than blood warmth just off the cold. Then remove double
boiler and
beat with a rotary egg
beater until thick. Put into a bottle. Keep in refrigerator and shake well before using. Do not let
mixture get too warm. It will not thicken if you do.