I have written so many recipes for trifle, I scarcely dare reiterate my love for it. But this, perhaps the most traditional of my offerings, shows the sensational, time-honoured pud at its glorious, many-layered best: the jam-slashed and sherry-sodden sponge, the sharp fruity layer of flavour-oozing berries, the eggy custard and the whipped cream. On top, my favourite colour combination: the Victorian pink of crystallised rose petals with the tender green of chopped pistachios. Perfection.