Guimauve is the French iteration of marshmallow, distinguished from industrial versions by its reliance on Italian meringue as the aerating base, natural flavourings, and a tender, melt-on-the-tongue texture. The name derives from the marshmallow plant (Althaea officinalis), whose root mucilage was historically used as the setting agent before gelatin replaced it in the 19th century. The professional formula begins with blooming 20–24g sheet gelatin (gold grade, 200 bloom) in cold water. A sugar syrup of 300g sugar, 100g glucose syrup, and 100g water is cooked to 118°C (firm ball stage). Simultaneously, 100g egg whites are whipped to medium peaks. The hot syrup is streamed into the whites in the manner of Italian meringue, and whipping continues at high speed for 8–10 minutes until the bowl is warm but no longer hot (approximately 50°C). The squeezed, bloomed gelatin is added to the warm meringue and whipped for an additional 2–3 minutes until fully incorporated. Flavourings — vanilla extract, fruit purée reductions, or nut pastes — are folded in at this stage. The mixture is immediately transferred (it sets quickly as gelatin cools) into a frame lined with a 50/50 blend of cornstarch and icing sugar, spread to 2–3cm thickness, and dusted on top with the same starch-sugar mixture. Setting requires a minimum of 4 hours at room temperature, though overnight yields a cleaner cut. Once set, the slab is turned out, cut into cubes or cylinders with an oiled knife, and rolled in the starch-sugar blend. The gelatin content determines texture: 20g per batch yields a pillowy, delicate guimauve; 24g gives a firmer, more structured confection suitable for dipping in chocolate. For fruit-flavoured guimauve, concentrated fruit purée (reduced by half) replaces a portion of the water in the syrup — up to 100g purée — to maintain flavour intensity without adding excess moisture that weakens the gel.
Build on an Italian meringue base — hot syrup at 118°C streamed into whipping whites; bloom gelatin separately and add to the warm (not hot) meringue at 50°C to prevent degradation; whip thoroughly to achieve maximum volume before the gelatin begins to set; dust frames and cut pieces with a 50/50 cornstarch-icing sugar blend to prevent sticking; flavour with concentrated purées or extracts to overcome the dilution of the sugar-gelatin base
For a vegan guimauve, substitute agar (3g) and aquafaba (100g) for gelatin and egg whites — whip aquafaba to stiff peaks, fold in agar-set syrup at 80°C; toast finished guimauve cubes with a blowtorch for a brûléed exterior that caramelises the sugar coating; pipe the mixture through a star tip into long ropes before setting for a more refined presentation; for enrobed guimauve, ensure pieces are at 18°C and free of surface starch before dipping in tempered chocolate
Adding gelatin to meringue that is too hot (above 60°C), partially denaturing the gelatin and weakening the set; under-whipping the meringue, resulting in dense, under-aerated marshmallow; using fruit juice instead of reduced purée, adding too much water and preventing a firm set; cutting with a wet knife instead of an oiled one, which leaves ragged edges and sticks to the confection; unmoulding too early before the gelatin has fully set, causing deformation
Pierre Hermé, Macaron; Philippe Urraca (MOF), Traité de Pâtisserie; Le Cordon Bleu, Pâtisserie and Baking Foundations