Rav Oshry was asked two questions before Pesach concerning coping with the lack of food while at the same time trying to keep the various eating restrictions that come with the holiday.
The first question was whether people would be allowed to eat kitniyot if they became available, despite the general custom not to eat them. Rav Oshry ruled, based on the Chatam Sofer, that in a שעת הדחק one would be allowed to consume kitniyot, provided that he washed them to ensure that there was no grain mixed in with them.
The second question was more complex. Some of the Jews who worked in the forced labor camps had found potato skins and wanted to mix them with some flour in order to produce matzah. Since fruit juices mixed with flour do not produce chametz, this theoretically could have worked. However, since the skins were dirty they wanted to first clean them, and they were concerned that by introducing water into the mix that would actually reverse the situation, whereby the water and flour would mix and the juices of the potato skins would serve to speed up the fermentation process and thus the mix would definitely become chametz. Rav Oshry advised, based on the ruling of Rav Avraham Dovbear Kahana Shapiro, that they wipe the skins clean with a cloth and then bake matzot from them, thus avoiding the introduction of water.
מי כעמך ישראל גוי אחד בארץ
לז"נ קדושי עמך ישראל שמסרו נפשם על קדושם השם