Why to remove skin and seeds of tomatoes when we puree them?
I tried a couple of recipes which demanded tomato puree which was eventually cooked as part of the gravy. The gravy turned sour even after cooking it covered for more than 15 minutes. Is that because I didn't get rid of the skin and the seeds? Is that why they remove skin and seeds after boiling them for making puree? I wonder if it's just for texture or for taste too. Also, recipes like butter chicken require ripe tomatoes. But even after using somewhat ripe tomatoes (directly blended in a mixer), the gravy stays sour. What exactly goes wrong here? I've seen a couple of recipes of butter chicken from decent sources that use a large number of tomatoes (e.g. this recipe uses 12 tomatoes for 400 gm boneless chicken), I just wonder why the heck it doesn't turn sour in their case? I know they add honey and cream, but still.
Too many questions I guess in one go, but they are closely related according to me.
Edit - At least the red-looking tomatoes that we get here in India have sour/tangy taste. But they are still eatable when raw. But a large quantity of tomatoes should make the gravy sour, shouldn't they? I wonder why they don't when chefs follow those recipes. Not sure if any of you guys have experienced this issue before.
Also, the reason I ask about tomatoes and sour gravies in the same question is that, is it just about ripeness of tomatoes or the way of cooking/pureeing them which makes difference to the sourness of the gravy.
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It is possible that the tomatoes you are using are under ripe, however could I suggest another possibility, are you using an aluminium pan? Tomatoes are acidic, and they can react with the metal in an aluminium cooking pot to change the flavour in a way that might taste unpleasant or metalic.
noshon.it/tips/tomatoes-and-aluminu/
If it is not the pan, then you should concider the variety of tomato you are using, if available try using smaller cherry tomatoes which are sweeter, or if using bigger beef tomatoes try adding a pinch of granulated sugar whilst cooking.
For whatever reason, the brand of tinned tomatoes I used to buy regularly had somewhat bitter-tasting seeds; the flavour was definitely present in pureed soups / sauces.
I used to squeeze them all out by hand, but some still made it into my precious San Marzano tomato sauces.
Then I found the perfect tool for skinning and seeding larger quantities of tomatoes: the food mill.
For the next several years, I dutifully used my mill to remove seeds from my favorite brand of (already skinned) tinned tomatoes - boring, yes, but the bitterness was gone.
Sometime during this period, I switched to a different brand of tomatoes. Then I got bored of the food mill, and pureed them whole again... with no bitterness.
The moral of the story? Eat some of the seeds! If they're bitter, get rid of them before you puree. If you don't really notice, then don't bother.
My food mill still makes great mashed potatoes. Or are they milled potatoes?
From a soup/sauce perspective, the reasons you may want to remove the seeds and skin:
They taste bad/different to you.
You don't like the texture they add.
You are trying to impress someone. I think a smoother product is nicer.
If none of these bother you, don't bother. There's no reason you should't eat all of a tomato.
Note
To remove the skin, cut a cross in the bottom of the tomato and blanche them. The skin should come off readily.
To get rid of the seeds, I would suggest cutting the top and bottom off of the tomato. So you have a barrel shape. Cut enough off so that you can see the seeds from both ends. Now you can cut around the cluster of seeds in the middle. Save the seeds for a stock.
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