PASSION FRUIT AND LEMON MERINGUE PIE RECIPE

500g shortcrust pastry • 8 passion fruit • 3 lemons, zest of 2, juice of all • 100g caster sugar • 2 tbsp cornflour • 100ml double cream • 50g salted butter • 5 egg yolks (reserve the whites for the meringue) • 1 egg • Meringue: 250g caster sugar • 5 egg whites • 2 tsp cornflour