Place the flour on a clean work surface and create a well in the centre.
Add the egg and egg yolk and bring together slowly with a fork, working from the edges to the centre.
Once most of the flour is incorporated, knead for 10 minutes, then wrap in cling film and rest for 30 minutes.
Heat a dry 30cm or 12" frying pan over a high heat, when hot add the spinach and a tablespoon of water, then cover with a lid and cook for 2 minutes.
Remove the lid, stir and continue to cook off any liquid until the base of the pan is dry, then cool the spinach.
Zest the lemon.
When cooled, place the spinach in a dry, clean tea towel and squeeze out as much liquid as possible.
Chop the spinach, then place it in a bowl with the ricotta cheese, lemon zest, pecorino cheese and black pepper, then mix well. Have a taste of the filling and add salt to taste. Remember that the pasta will be cooked in salted water!
Bring a 24cm or 10" saucepan of well-salted (I use 2 teaspoons of salt in a pan this size) water to the boil
Roll out the pasta as thinly as you can using a pasta machine.
Dust a ravioli mould with flour and add a sheet of pasta.
Fill the holes with the stuffing and cover with a second sheet of pasta. Then dip your finger in water and run around the edges of each ravioli "hole". Roll with a rolling pin to seal, then turn out and cut into ravioli.
Heat the frying pan you used to wilt the spinach over a medium-high heat and add the butter.
Drop the ravioli into the boiling water and cook for 1-2 minutes or until they begin to float.
Add the capers to the butter when it begins to foam.
Add the drained ravioli to the butter, squeeze in the juice of half a lemon and add the parsley.