Fool is one of those British desserts that sounds modest and delivers completely. The formula is almost embarrassingly simple — cooked, mashed fruit folded through whipped cream and either custard or yoghurt — but simplicity is the point. You're not hiding anything; you're amplifying it. This version uses blackberries and apple, both at peak availability right now, with ground cinnamon and ginger warming the fruit compote. The skin stays on the apple (finely diced, so it softens into the mix), which saves prep time and adds fibre. These are small decisions that add up to a recipe with genuine intelligence behind it. The custard base is the interesting move here. Most modern fools default to yoghurt — faster, less rich — but custard gives you something thicker and more unctuous that holds its shape in the glass. If you have leftover custard, this is exactly where it belongs. The recipe is honest about this: it's a zero-waste vehicle, not a compromise. Technique matters in one place only: the fold. Two-thirds of the fruit purée goes into the cream and custard base; the rest stays separate for topping. You're after a ripple, not a homogenous pink mixture. Overfold it and you lose the visual drama and the textural contrast between the base and the burst of concentrated fruit on top. Serves two to four depending on glass size and appetite, which is exactly the right flexibility for a weeknight dessert or a simple dinner party finish. Chill it for a firmer set or eat immediately for something closer to a mousse. Either works.