Spinach ‘meatballs’ (Polpettine di spinaci)

Makes 26–28 1 kg (2 lb 3 oz) English spinach 3 egg yolks 75 g (2 oz) unsalted butter, at room temperature 30 g (1 oz) parmesan, finely grated, plus extra to serve, if desired Zest of 1 lemon, plus extra to serve, if desired 100 g (1 cup) dry breadcrumbs Extra virgin olive oil, for pan-frying Freshly […]