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6. Shaking waste off from foods:
Shaking off the thin peel from the grains: If one had kernels which were removed from before Shabbos from their stalks and are still mixed with their chaff they may not be sifted [out] with a Kenon or plate due to a decree that one may come to sift them with a sieve and sifter in which case one is liable. [Furthermore] even to do so with two hands, meaning to shake them from one hand to another in order to separate [the grains] from their thin peel [is forbidden]. Rather one is to sift them using a single hand placing into it all his strength in order to differ from the method that is used during the week (and thus not come to sift in a sifter). [See Q&A]
Summary-Shaking off the grains in order to remove their thin peels:
Is forbidden to be done with a vessel, or even through shaking from one hand to another. Rather it may only be done through shaking it strongly in one hand, [and even then, one may only do so to eat right away].
May one use his hand to sift food for right away use by spreading the fingers slightly apart and pouring the mixture over his hand?
No as this is not considered the way of eating, and it is thus equivalent to using a strainer.
May one shake grapes/peanuts/berries from hand to hand in order to get rid of the peels and stems?
 Admur 319:10; Michaber 319:7
 Chaff is the inedible, dry, scaly protective casings of the seeds of cereal grain, or similar fine, dry, scaly plant material such as scaly parts of flowers, or finely chopped straw. In agriculture chaff is used as livestock fodder, or is a waste material ploughed into the soil or burnt. The process of loosening the chaff from the grain is called threshing, and separating the loose chaff from the grain is called winnowing – traditionally done by tossing grain up into lightly blowing wind, dividing it from the lighter chaff, which is blown aside. This process typically utilizes a broad, plate-shaped basket, or similar receptacle for holding and collecting the winnowed grain as it comes back down. Chaff should not be confused with bran, which is finer, scaly material forming part of the grain itself.
 Halacha 10
 Shabbos Kihalacha Vol. 2 p. 381
 Vetzaruch Iyun how this differs from the case mentioned in Admur in which one sifts the waste out from the grains through shaking them in ones hands?