The madeleine — the small, shell-shaped cake that Proust immortalised — requires a specific batter resting and a very hot oven to produce the characteristic hump on its back (the boss or bosse). The hump forms because the chilled batter, when placed in a very hot oven, forms a crust on the exposed surface before the batter below has had time to rise — the interior batter, forced upward as it heats, produces the hump.
- **The batter:** Flour, sugar, eggs, butter (beurre noisette — brown butter — which gives the madeleine its characteristic nutty depth), baking powder, lemon zest. - **Resting:** 1–2 hours in the refrigerator minimum. The cold rest firms the batter and creates the temperature differential needed for the hump. - **The hot oven:** 210°C — hotter than most cake baking. The high temperature is required for the rapid surface-crust formation that forces the hump. - **The mold:** Buttered and floured (or buttered and frozen) madeleine molds — the chilled mold further ensures rapid crust formation. - **Baking time:** 10–12 minutes only. The characteristic madeleine texture — soft, slightly dense, buttery — requires this brief time. Decisive moment: The hump formation at 6–7 minutes of baking. The characteristic boss should have risen clearly by this point. If no hump at 8 minutes: the batter was too warm (insufficient rest), the oven was not hot enough, or the mold was at room temperature.
France: The Cookbook