Preheat oven to 210℃/410℉.
Lightly grease a 12 cup muffin/cupcake non-stick baking tray.
Thaw puff pastry sheets and cut into 12 rough squares.
Push puff pastry lightly into each muffin cup, ensuring there's some overhang. It doesn't matter if they're not perfect, as long as they're a decent shape (wings even?) and enough to contain the curd.
Place a tablespoon of curd into each pastry square (this would be a teaspoon if you're making tinier tartlets; it's really of case of judging by sight).
Bake until golden.
When cooled, sprinkle with icing sugar or top with fruit, or whipped cream.