Si and Dave served up a courgette flower tart on Kitchen Garden Live with the Hairy Bikers.

The ingredients are: 2 tbsp olive oil, ½ onion, thinly sliced, 2 garlic cloves, thinly sliced, 8 large Swiss rainbow chard leaves, white stalks discarded, roughly chopped, 2 tbsp mint leaves, finely chopped, 2 tbsp fresh parsley, finely chopped, 350g ready-made all-butter puff pastry, 100g ricotta cheese, 1 lemon, zest only, 6 courgette flowers, cut in half lengthways if large or 1 courgette, thinly sliced lengthways, 75g feta, crumbled, 50g Parmesan (or other vegetarian hard cheese), finely grated and 1 free-range egg, lightly beaten.