2 lemons, juice and zest
12 passion fruit, pulp only, to serve
3 limes, juice and zest
150²µ/5½´Ç³ú caster sugar
175g/6oz caster sugar
½ tsp sherry vinegar
150g/5oz butter, softened
200g/7oz double cream, whipped until soft peaks form when the whisk is removed
3 free-range egg whites, whisked in a clean bowl until stiff peaks form when the whisk is removed
3 free-range eggs, plus 5 free-range egg yolks