[mumofstig]

It is easy to use a stick (immersion) blender, to make pasta sauces 
but that doesn't remove the skins or the seeds.......... you really need to do both to make passata for bottling.

Some people can't tolerate seeds or the skin, no matter how small it's chopped - and as DBG says sometimes the seeds make the sauce too acidic for sensitive stomachs.
I take the seeds out for passata but leave them in for pasta sauces - I always remove the skins, though, whatever I'm doing   

[Growster...]

Mrs Growster blends the whole lot, skins and all, as a good electric swirl for a few minutes just makes them - er - 'chewy'...

Everyone likes a bit of bite, don't they..?

[Yorkie]

Admittedly I had to look up what "passata" is and what a "passata" machine looks like. Here in the States we call the machine a food mill lol.

Hi LotuSeed

Would you be able to pop the fact that you're in the US into your forum profile please?

Otherwise we'll keep forgetting this, and think you're in the UK 

Ta 

[Growster...]

So sorry Mum, I didn't realise you'd commented just before me!

Of course, some people will want to do what you describe, and I have to admit that it was always my own  idea (not Mrs Growster's) to just chuck them in and grind the toms down, skins, pips and all, as I got fed up with removing all with the blanching etc..;0)

I'm sure your passata is a load better that the one I planned, but we're inundated with them at the moment, and need to compromise...

I bow to your experience, and crave your forgiveness...;0)

[mumofstig]

No need Growster, as I said - it's all down to taste and what your tum will tolerate 

I'm sure that your sauce is molto buono - but please don't call it passata - unless it is skin and seed free   

[devonbarmygardener]

Mrs Growster blends the whole lot, skins and all, as a good electric swirl for a few minutes just makes them - er - 'chewy'...

Everyone likes a bit of bite, don't they..?

I hate finding skin and hard tomato tops in my pasta sauces 
I always chop the tops off tinned plum toms when I use them in cooking