1. One may perform tochen with a significant shinui (change in the normal method) if it is for immediate use. However, the rules for what constitutes a shinui are complex and should not necessarily be relied upon practically in many cases (though see below).

2. Poskim agree that a shinui may be used in the following specific case: One may use the back of a spoon or knife to mash a banana or other fruit if it is for immediate use (Chazon Ish, Igrot Moshe). Some also allow using the prongs of a fork to mash (Ohr Ltzion), while many others do not allow this (Orchot Shabbat). For more information on this subject, see Tochen (Grinding, Mashing, Cutting) on Shabbos - Din - Ask the Rabbi And Tochen - Halachipedia.

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Dedicated by Fran Broder as a zechus for the hostages to be released safely to their families and may everlasting peace come to Eretz Yisrael in the merit of learning Hilchos Shabbos.