Île Flottante — The Poached Meringue and What Temperature Does to Egg White

Ingredients

• 4 eggs, whites and yolks separated; whites must be viscous — discard any watery white
• 100 g caster sugar, for the meringue
• 1 litre whole milk, for poaching; reserved afterward as the crème anglaise base

Method

1. 1
   Before any mixing begins, tilt the bowl containing the separated whites: a fresh white is viscous and holds together as a cohesive mass; a stale white runs freely. Discard any white that runs. Inspect the bowl, whisk, and every surface that will contact the whites — wipe with a clean cloth dampened with a little vinegar or lemon juice and dry thoroughly. A single trace of fat or residual yolk will prevent foam formation.
2. 2
   Beat the egg whites in a clean, grease-free bowl until soft peaks form. Add the caster sugar gradually, continuing to beat until the meringue is glossy and holds firm but not stiff peaks. This is a French meringue — the sugar is not cooked.
3. 3
   Bring the milk to a bare simmer in a wide, shallow pan — approximately 90 °C. The surface should shiver; there must be no rolling boil. Boiling agitation collapses the meringue. This is where the dish lives or dies: hold the milk at this temperature throughout poaching. If the milk boils, reduce the heat immediately and allow it to settle before proceeding.
4. 4
   Using two large spoons, shape the meringue into rough oval quenelles. Lower each one into the simmering milk. Watch for visible swelling — each meringue should puff by 30–40% within the first minute. If no puffing occurs, the milk is insufficiently hot. Poach for approximately 2 minutes on the first side.
5. 5
   Turn each meringue once using a slotted spoon and poach for a further 2 minutes. Remove and set aside. Press the surface of one meringue gently with a fingertip: it should yield, then spring back slowly and incompletely. Immediate, full elastic rebound indicates overcooking. No rebound at all indicates an undercooked, wet interior that will weep on the plate.
6. 6
   Reserve the poaching milk. Use it as the base for a crème anglaise made with the reserved egg yolks: the milk carries the flavour of the poached meringue. Prepare the crème anglaise according to the standard method and cool to a pourable consistency. Pour into shallow bowls and float the meringue islands on the surface. The meringue centre should remain slightly trembling — it will continue to set against the warm crème anglaise.