Spinach and ricotta gnudi recipe

Ingredients

• 1 pinch sea salt flakes and freshly ground black pepper
• 250 g ricotta, preferably fresh rather than UHT
• 470 g spinach, coarse stalks removed
• 30 g unsalted butter, plus 50g (1¾oz) to serve
• 1 quarter of a small onion, very finely chopped
• 2 egg yolks
• 100 g finely grated parmesan cheese, plus more to serve
• 1 pinch freshly grated nutmeg
• 30 g plain flour, plus more to dust