Fondant icing. Not to be confused with fondue. Fondant icing, also commonly referred to simply as fondant (UK: /ˈfɒndənt/, US: /ˈfɑndənt/ or /ˈfɑndɑnt/, from the French: /fɔ̃.dɑ̃/ listen ), is an edible icing used to decorate or sculpt cakes and pastries. It is made from sugar, water, gelatin, and glycerol.