French-style glace is distinguished from American ice cream by its egg-yolk-enriched custard base, known as crème anglaise, which yields a denser, silkier texture. The standard formulation calls for 500 ml whole milk, 250 ml heavy cream (35% fat), 5-6 egg yolks, and 150 g sugar. The custard is cooked to 82-84°C—the nappe stage at which the mixture coats a spatula and a finger drawn through it holds a clean line. Exceeding 85°C causes irreversible protein coagulation and a granular texture. After straining through a fine chinois, the base is immediately chilled over an ice bath to pass through the 40-10°C danger zone within 90 minutes, then aged at 4°C for a minimum of 4 hours, ideally overnight. Ageing allows fat globules to partially crystallise and proteins to hydrate fully, improving body and reducing iciness. The base is churned in a batch freezer or domestic machine until it reaches -6 to -8°C, at which point approximately 50% of the water is frozen and the mixture has gained 40-60% overrun (air incorporation). Overrun must be controlled: too little yields a dense, icy mass; too much produces a foamy, insubstantial texture. The role of sugar extends beyond sweetness—it depresses the freezing point, and substituting 10-15% of sucrose with atomised glucose or invert sugar (trimoline) lowers the freezing point further, yielding a scoopable consistency at -18°C service temperature. Stabilisers such as locust bean gum (2 g per litre) may be incorporated to retard ice crystal growth during storage. Once churned, the glace is transferred to pre-chilled containers and hardened at -35°C in a blast freezer for rapid crystallisation, producing the finest possible ice crystal structure.
Cook custard base to exactly 82-84°C (nappe stage) for proper emulsification; age the base overnight at 4°C for improved texture and reduced iciness; control overrun between 40-60% during churning; use a mix of sugars (sucrose plus glucose or trimoline) to manage freezing point depression; blast freeze at -35°C after churning for finest crystal structure
Blanch yolks with sugar for 2 minutes before adding hot milk to prevent coagulation shock; add a pinch of fine salt (1 g per litre) to amplify flavour perception in frozen products; temper glace at -12°C for 10 minutes before scooping for service; for fruit-infused glace, steep fruit in warm milk, strain, then proceed with custard method
Overheating the custard past 85°C, scrambling the yolks and creating graininess; skipping the ageing step, producing ice cream with a coarse, icy body; over-churning, which incorporates excess air and produces a fluffy, unstable texture; storing at temperatures above -18°C, accelerating ice crystal growth and freezer burn; using only sucrose, resulting in a rock-hard texture at serving temperature
Escoffier, Le Guide Culinaire; Lenôtre, Lenôtre's Ice Creams and Candies; Corvitto, Los Secretos del Helado