¼ c white vinegar
1 t poppy seeds
¼ t salt
½ c vegetable oil
¼ c sugar
1 ½ t dehydrated onion
1 ½ t prepared mustard

Mix all ingredients (except oil) until sugar is completely dissolved. While beating on high, speed drip 2-3 drops of oil into mixture. Gradually add remaining oil in a thin stream to complete emulsification.