I live in America, and I wonder if I can use granulated sugar in place of caster sugar? Thanks very much.
Nigella's Forgotten Pudding (from NIGELLA EXPRESS) is a soft, marshmallowy base topped with whipped cream and fruits. The base is a type of meringue made with whisked egg whites and sugar. It is left in a switched off oven overnight, hence the name "forgotten".
In the UK granulated sugar is quite coarse, so Nigella uses the finer-grained caster sugar as it dissolves much more easily in the whisked egg whites. In the US granulated sugar is finer than that sold in the UK and can be used for some cakes and cookies. However we feel that it may still not dissolve fully enough in the egg whites, which would cause beads of syrup to form on the base, making it sticky. So we would prefer to use superfine sugar as this will dissolve quickly.