This may sound like a bit of a wacky idea, but it is not only delicious, but gloriously pretty as well.
250-300g puff pastry, rolled to about 2mm thick and left to rest for at least an hour
6 or so medium-sized red beetroots, cooked, peeled and thinly sliced
30g butter, melted
Crème fraîche, to serve
Preheat the oven to 200C /gas mark 6. Cut the puff pastry into four 12cm discs and prick all over with a fork. Fold the trimmings over, wrap in clingfilm and keep for another recipe.
Put the discs on to a baking tray lined with siliconised or greaseproof paper, or re-useable Teflon sheets like Bake-O-Glide. Lay the beetroot slices around the pastry discs, overlapping them and tucking the last slice under the first to form an even pattern.
Brush the beetroot with butter and dust generously with the sugar. Bake for about 30 minutes, or until the beetroot begins to caramelise, scattering more sugar and brushing more butter on halfway through cooking.
Serve with the crème fraîche spooned in the centre of the tarts.