Opéra cake was created by Cyrille Gavillon at the Dalloyau patisserie in Paris in the 1960s. His wife, Andrée Gavillon, named it after the Paris Opera. It became the signature preparation of Dalloyau and was adopted widely. It remains the benchmark test piece of the Parisian pâtissier.
Six layers of joconde sponge (an almond sponge), each soaked in coffee syrup, alternating with coffee buttercream and chocolate ganache, the whole finished with a mirror-flat chocolate glaze. Opéra is the pinnacle test piece of classical French patisserie assembly — it requires the correct execution of five separate preparations (joconde sponge, coffee syrup, coffee buttercream, chocolate ganache, chocolate glaze) and the assembly precision to produce a perfectly level, perfectly glazed, sharply cut rectangle that shows all six layers at an exact 2cm height per slice. It is not a recipe — it is a system.
**Joconde sponge (biscuit joconde):** - Ground almonds, icing sugar, eggs (beaten whole), and egg whites (beaten separately to soft peak) — folded together with a small quantity of flour and melted butter. - Baked thin (5mm) at 220°C for 8–10 minutes on a silicone mat. - Three identical sheets are required — each becomes two layers (cut in half) for the six-layer assembly. **Coffee syrup:** espresso + sugar syrup. Strong — it must penetrate each sponge layer and flavour it distinctly. **Coffee buttercream:** Italian meringue buttercream (Entry 90 meringue base) with strong coffee extract or dissolved instant espresso. **Chocolate ganache:** dark couverture (70%) and cream — 1:1 ratio, made as per Entry 93. **Chocolate glaze:** dark couverture, cream, glucose — a poured glaze that sets to a mirror finish. **Assembly:** 1. First joconde layer, soaked with coffee syrup. Apply coffee buttercream layer. 2. Second joconde layer, soaked. Apply chocolate ganache. 3. Third joconde layer, soaked. Apply coffee buttercream. 4. Fourth joconde layer, soaked. Apply chocolate ganache. 5. Fifth joconde layer, soaked. Apply buttercream. 6. Sixth joconde layer, soaked. 7. Refrigerate until completely set. 8. Pour tempered chocolate glaze over the flat, cold surface. Allow to set. 9. Trim the edges with a hot knife to reveal the cross-section. Portion with a hot dry knife. Decisive moment: The chocolate glaze pour — specifically, the surface preparation. The top of the assembled, refrigerated cake must be perfectly flat and cold before the glaze arrives. Any surface irregularity is amplified by the glaze, which flows to the lowest point and creates an uneven surface. If the assembled cake is not perfectly flat: run a heated palette knife across the surface of the final buttercream layer before refrigerating.
Jacques Pépin's Complete Techniques