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

Île flottante (floating island) — poached meringue islands floating on a sea of crème anglaise — is among the oldest surviving preparations in the French dessert canon. Menon described a version in the eighteenth century. It is simultaneously the most technically forgiving of the classical French desserts (no precise temperature window, no assembly precision, no fragile structural elements) and the most revealing of ingredient quality — egg whites that are fresh will produce billowing, light meringue; stale whites produce flat, weeping masses. The skill is in reading the whites before the technique begins.

Île flottante meringue is a French meringue (uncooked whites beaten with sugar) formed into rough oval quenelle shapes and poached in simmering milk (which is then used as the base for the crème anglaise). The poaching is the non-classical technique — most meringues are baked; this one is cooked in liquid. The milk's gentler heat (approximately 90°C at a bare simmer) sets the exterior of the meringue without drying it. A correctly poached île flottante is billowy, slightly trembling, with a surface that dimples when touched and springs back slowly. A baked meringue (oeufs à la neige — a related preparation, sometimes confused with île flottante) has a dry exterior crust; the poached version has no crust at all — the surface is as soft as the interior.

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