Here's how I made it
A stockpot full of silverbeet minus the stalks, then wilt them
Put into a blender with
About half a lemon of lemon juice, thnk ma have used a whole one and then some. It was a generous squeeze from the lemon bottle.

2T olive oil
Salt and pepper (and lemon juice lol) to taste
20grms of Parmesan cheese (or 40ish for a nut free version)
Large handful of walnuts (which I couldn't use as we are a nut free household, so I just added more Parmesan cheese)
Then blend it all up.
Even got the thumbs up from he kids.

We quite often buy a jar of pesto and mix it last into a chicken stir fry and cooked penne pasta (with extra cheese added). It's one of the kids favourites for dinner, so hopefully my pesto version is a similar hit.