Precise timing, narrow margin for error. Underbake by 30 seconds and the centre stays molten. Overbake and it's just cake. It's the exposure latitude of slide film — no forgiveness, only accuracy.
Lava cake is a timing exercise. Twelve minutes at 200°C. Not eleven, not thirteen. The edge sets, the centre stays liquid. It's controlled undercooking — you're deliberately stopping the process before completion. In the darkroom, it's like pulling a print from the developer early to preserve highlights. You're managing the chemistry in real time.
The butter and cocoa coating on the ramekin is functional — it prevents sticking and creates a non-reflective surface. When you invert the cake, it should release cleanly. The outer shell is firm enough to hold structure, but when you cut through, the interior flows out like developed emulsion. Dark, glossy, molten chocolate. It's dramatic, immediate, irreversible. Once you cut it, the moment is over.
You serve it hot, straight from the oven. If you wait, the centre sets and you lose the effect. The cream is optional, but it adds contrast — cool against hot, white against dark. The richness is extreme. You don't need a large portion. This is concentrated flavour, high-contrast composition, no room for error. It's why it works.