Crème pâtissière — vanilla pastry cream — is the most important pastry preparation in the French tradition: it is the filling for éclairs, mille-feuille, Paris-Brest, tarts, and dozens of other preparations. The technique: a starch-stabilised egg custard that holds its shape at room temperature, unlike crème anglaise (unstabilised, pourable). The starch (cornstarch or flour) provides both the thickening and the heat stability that allows the cream to be heated above 85°C without curdling.
- **The starch:** Cornstarch produces a lighter, cleaner cream; flour produces a slightly denser, less refined result. - **Tempering:** Hot milk poured slowly onto the egg-sugar-starch mixture while whisking — the gradual temperature increase prevents the eggs from scrambling. - **Cooking after tempering:** The tempered mixture returned to the heat and cooked while whisking constantly until the starch fully gelatinises and the cream thickens — must reach a full boil for the starch to fully cook out (identical to the besciamella principle, HZ-09). - **The butter addition:** Cold butter beaten into the hot cream off heat — produces the gloss and richness that distinguishes pastry cream from cornstarch pudding. - **Rapid chilling:** The cream must be spread thin and chilled immediately — the window between 65°C and 4°C is the danger zone for bacterial growth. Cover with plastic wrap pressed directly onto the surface to prevent a skin from forming.
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