In Italy, August is the month of  ‘i pomodori’. Where they make pasta sauce for the whole coming year. The tomatoes are boiled, ‘passati’ (literally ‘passed’ through a sieve), reboiled and bottled. There is a lovely video here which shows you.

Because it’s quite a job, it tends to be done with everyone pitching in. It’s very low-tech (or used to be). Because the raw materials are the sweetest tomatoes the salsa you get (or passata) is incredible.

I never hoped to reproduce that in the UK, but my mother makes a very keen contender in her kitchen, in central London. She has even made it in my kitchen. I have tried to replicate it, I have watched her do it. I have bought the exact same ingredients as her, but it’s never the same.

If I have frozen salsa, and I serve it up on some pasta at a later date, my children can tell, immediately, if it’s ‘Nonna’s salsa’ or mine. They say her secret ingredient is salt, and love. And it’s true I tend to under salt things. For this I didn’t and went large with the salt.

It was a secret shame of mine, that I couldn’t make salsa as good as hers or any of my Italian relatives. Not because there is any shame in it really, but because, well, I cook a lot and you’d think this simple thing would not be beyond me. I tried cooking with plum peeled tinned tomatoes, chopped tomatoes,  fresh tomatoes, roasted tomatoes (this does work very well but is another layer of work), passata, all of the above and added tomato puree to it…but nothing came close. It all tasted too ‘new’ and didn’t have that complex taste, it always had a ridge of acidity, and none of the thickness of my family’s salsa.

“You needa to cooka it for a long time,” my Ma says – to take the acid out of the tomatoes. But whenever I tried I burnt it.

This year, I decided I really needed to step up. My mum and all the female relatives who hold the secret to good salsa are all…getting on.

So this is what I did. It’s so simple I am embarrassed I never tried it before and you will be disappointed there is no real secret recipe. Well there is. The secret is it’s really simple.

Warning, you really need a slow cooker and I think this goes some way to compensate for the fact that you are not using super red, sweet tomatoes from southern Italy. I have this one and it is a wonderful bit of kit which I use regularly and thoroughly recommend.

You take:

A jar of passata, I use Cirio’s Passata Rustica, 680g

One onion

A big pinch of sea salt

A clove or two of garlic if you like, chopped

Some very good olive oil (the better the better) – don’t skimp, this gives the sauce flavour

That’s it. Don’t add water or anything else. You finely chop the onion and fry it in the olive oil. I do this in my slow cooker as it has a saute function. When soft, you add the garlic if using and cook for a minute or so. It is at this point I add the salt but you can add it at any point, even at the very end, but give it a good stir through.

If you can’t saute in your slow cooker, and have been doing this on the stove top in a pan, you now add the onion, garlic and any remaining oil to your slow cooker. Then the passata.

Put down the lid and you cook it in the slow cooker, on low, for hours. At least six but 12 if you can. Then you take it out, cool it, use it all at once or store it in glass jars in the fridge (it keeps for a good few days) or freezer.

You can easily double/triple etc this recipe so you can make a batch up every few weeks and store it in the freezer so you are always good to go. And you will always have super-wonderful home made salsa for your pasta or pizza or whatever.

You can add herbs later but honestly, you just don’t need to. Yesterday I did as above, but cut up some sausages and stuck them in (lightly sauted first but you don’t need to) – you could also put meatballs in. I cooked it overnight for 12 hours and it was superb on pasta for lunch.