Start with the meringue: put the egg whites into a spotlessly clean bowl and whisk until they hold soft peaks. Now add half the sugar and whisk to blend well with the egg white. Add the remaining sugar and whisk again until the mixture is thick and shiny and holds stiff peaks. You should be able to turn the bowl upside down without anything sliding out.
Line a baking sheet with baking parchment. Dollop dessertspoonfuls of meringue on the sheet and place in an oven preheated to 120°C/Gas Mark ½. Leave for 2 hours, until the meringues are completely dry and crisp on the outside (they will still be a bit squidgy in the middle) and can be lifted off the paper easily. Remove and leave to cool completely.
Meanwhile, halve the strawberries, thickly slicing any whoppers. Put in a large bowl with the raspberries and sugar. Roughly crush and squeeze a few of the berries with your hands so the juices start to run. Cover and leave to macerate in the fridge for an hour or two.
To assemble the mess, break the meringues into rough pieces, then fold into the whipped cream. Now lightly fold in the chilled fruit, so everything is rippled together rather than thoroughly blended. Pile into glasses and serve. You can make it an hour or so in advance, but not more, or the meringue will go weepy in the cream.
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