6–8 asparagus spears, trimmed and shaved
1 lemon, zest only
2 thyme sprigs, leaves picked and roughly chopped
50²µ/1ΒΎ΄Η³ϊ plain flour, for dusting
freshly ground black pepper
3 free-range eggs, 2 yolks and 1 whole, beaten
40²µ/1Β½΄Η³ϊ Parmesan, grated, to serve
1 x 320g/11Β½oz puff pastry sheet
250g/9oz ricotta, hung overnight and crumbled