They made them into pestles to bruise pepper and herbs for their sauces.
Peter of Vaux-de-Cernay Quotes
Peter of Vaux de Cernay (Latin: Petrus Vallium Sarnaii; died c. 1218) was a Cistercian monk of Vaux-de-Cernay Abbey, in what is now Yvelines, northern France, and a chronicler of the Albigensian Crusade. His Historia Albigensis is one of the primary sources for the events of that crusade.
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Quotes and notes from Wikiquote: Peter of Vaux-de-Cernay (page history), available under CC BY-SA 4.0.