Apple Soufflé

To Make the Purée

Peel, core, and thinly slice the apples and put them in a heavy-based pan with the sugar, water, and lemon. Cover and cook over medium heat, stirring often, until the apples have formed a soft, even purée, 30 to 40 minutes. The time varies with the type and ripeness of the apples. Remove the lid and cook, stirring constantly, until the pur