Glaçage miroir is a reflective coating applied to entremets and mousse cakes, prized for its glass-like surface that mirrors the surrounding environment. The glaze is a gel-stabilised syrup composed of water, sugar, glucose syrup, condensed milk, gelatin, and chocolate or colour. A standard formulation: 150 g sugar, 150 g glucose syrup, and 75 ml water are boiled to 103°C, then poured over 150 g chopped chocolate (white, milk, or dark depending on desired colour) and 100 g sweetened condensed milk. Bloomed gelatin (12-15 g sheet gelatin, soaked in cold water) is added to the hot mixture and stirred gently with an immersion blender held at an angle to avoid incorporating air. Every bubble trapped during blending becomes a visible flaw in the finished glaze. The mixture is strained through a fine sieve, then cooled to the precise pouring temperature of 30-35°C. This window is non-negotiable: above 35°C the glaze runs off the cake without adhering; below 28°C it sets prematurely in lumps and streaks. The frozen entremet (at -18°C or colder) is placed on a wire rack over a tray, and the glaze is poured in a single, steady stream starting from the centre, allowing it to cascade over the edges. The thermal shock of the frozen cake meeting the warm glaze causes rapid setting, trapping the mirror-smooth surface. Excess glaze dripping from the base is trimmed with a palette knife once partially set. For marbled effects, multiple colours at identical temperatures are poured simultaneously or swirled with a toothpick within the 15-second window before the glaze sets. The glazed cake must thaw in the refrigerator for 4-6 hours before service, during which the glaze maintains its reflective finish if humidity is controlled below 60%.
Blend with immersion blender at an angle to avoid trapping air bubbles; pour at exactly 30-35°C for proper adhesion and flow; the cake must be frozen solid (-18°C) for thermal-shock setting; strain the glaze through a fine sieve to remove any particles; thaw glazed cake in low-humidity refrigeration to preserve the mirror finish
Prepare the glaze the day before and reheat gently to 35°C, which allows bubbles to rise and dissipate overnight; use a digital thermometer inserted into the glaze to verify pouring temperature precisely; collect excess glaze from the tray, strain, and reuse for up to three applications; for vibrant colours on white chocolate glaze, use oil-soluble food colouring rather than water-based dyes
Blending aggressively and incorporating air, causing a matte, pockmarked surface; pouring glaze at the wrong temperature—too hot runs off, too cold sets in lumps; glazing a cake that is not frozen solid, resulting in uneven coating and poor adhesion; attempting to touch up drips after the glaze has begun to set, creating visible patches; storing the glazed cake uncovered in a humid refrigerator, causing condensation and dulling
Bachour, Bachour Chocolate; Hermé, Pâtisserie; Grolet, Opéra