It is the egg whites in this rich chocolate cake that make the cake first rise. Once fully cooked, the cake sinks again to obtain a moist texture. Delicious served warm.
Preheat the oven to moderate 180°C (350°F/Gas 4). Line an 18 cm (7 inch) diameter, 5 cm (2 inch) deep cake tin (see Chef’s techniques). Grease the paper and dust with flour.