similar to what julio said, the main reason is that typical wheat-based noodles release a lot of starch into the water, which changes the consistency of the soup.
the starches can add a dirty colour to the water, but more than that, they can also thicken the soup undesirably (think of making a roux).
Finally, if there are leftovers, the noodles can sometimes become completely water logged, making eating it the next day a bit of a soggy experience.
That said, with all these considerations there are times when you might add the noodles directly in-- non-starchy noodles (eg.
like rice noodles) seem to do ok.
also parboiling regular pasta before hand seems to help a lot with the starch and can still help you achieve the flavour integration you mentioned.
cooking.stackexchange.com/users/2039/jessykate
Some people prefer to cook them separately because when you do so, you can see the water changes color a little and they don't want that (mainly flour) in their soups.
Another advantage is that you can have your soup ready and just cook the noodles on demand.
The noodles go to boiling water, the soup is just very hot, but not boiling.
That's what restaurants do.
If those reasons are not important for you, do as most of us do and cook them together :)
cooking.stackexchange.com/users/1546/Julio
That's how I cook noodle soup.
And yes, it does give them a nice flavor.
Just be sure you don't add them too soon: it's easy to over-cook the noodles by leaving them too long in the hot broth.
cooking.stackexchange.com/users/86/Shog9
With a cream-based soup the added starch adds desired thickness.
It isn't worse for the soup than adding corn starch or extra flour, and color change would be indistinguishable.
Same for a tomato-based soup, or an egg-flower soup.
I like robust soups in general, and I think throwing the water out in general is a terrible thing to do to a food product.
Any soup that calls for discarding more nutrients and flavor from a product already 'enriched' out of the crop's natural value isn't one I'd be interested in cooking.
Cooking flavor into the noodles beats wringing more out.
cooking.stackexchange.com/users/36696/Cameron
I suppose it you prefer a clear light soup, it would preferably be better to cook the noodles separately and then pour broth over to maintain the clearness of the broth and texture of the noodle.
cooking.stackexchange.com/users/51740/FACM
Well first of all, any sauce you make that'll have pasta in it, must have at least 1 to 2 tablespoons of pasta water in it, i.e. 1 to tbsp of the water you boiled the pasta with.
Second of all, it's all about the amount.
If let's say you're adding a 1/2 cup of rigatoni or fussili
then you're fine, add'er up; but be advised when reheating, pasta will break easily on you.
If you're putting let's say skinny noodle type pasta, then don't put it from the start.
What you can do is half boil the pasta in the normal water, drain it, and then add it to your soup 5 / 10 minutes before it's done.
cooking.stackexchange.com/users/87/dassouki
Any soup I cook that requires noodles gets put in the same pot as the other ingredients.
The noodles will have more flavor and it helps thicken up the soup for a heartier meal.
I have been doing this for quite a while and it is the ONLY way I cook noodles when they are going in a soup.
It really doesn’t have a different taste.
cooking.stackexchange.com/users/81210/Kristan L.
I will add uncooked noodles to soup that have been soaked for 1 hr.
As for thickeners, I prefer potato flour that keeps the broth a clear and translucent look.
Potato flour goes a long way as a thickener~go for 1/4 normal & add more if required.
cooking.stackexchange.com/users/84178/Kenny B
Most noodle soup recipes that I see call for boiling and draining the noodles separately, then adding them to the broth already cooked. Is there any reason that I can't just add the dry noodles 10 minutes before the soup is done, and add a little extra water or broth to compensate for that the noodles take? Doing it this way would allow the noodles to take up some of the broth's flavor, and also save dirtying an extra pot and a colander.
Can I add uncooked noodles directly to soup?
cooking.stackexchange.com
<soup><noodles>
cooking.stackexchange.com/questions/5420
cooking.stackexchange.com/users/1295/Matthew Scouten
Wheat-based noodles add starch to the soup, thickening and colouring it. Noodles in leftover soup can also become waterlogged. However, where clearness is not as important and especially in creamy soups that require some thickness, noodles can be added later in the cooking process. Cooking the noodles in the soup is a good idea if you want to thicken the soup up a bit. For a clear soup, it will make it a little cloudy, so this should be avoided.
This is not a good idea for clear light soups as the noodles will add starch to the soup and make it cloudy. You can do this for creamy soups as the noodles will release starch and thicken the soup up.