What's the point of sweating onions for a stew or sauce?

fuzzybabybunny

Moderator<br>Digital & Video Cameras
Moderator
Jan 2, 2006
10,455
35
91
I've always sweated onions when making beef stew, pasta sauce, etc. But I never know why.

Sweating onions brings out the sugars, but that can easily be substituted by just adding sugar directly instead of going through the trouble of sweating onions.

So is there something else going on? Perhaps the soft onions add some sort of texture or mouth feel or thickening action and that's why they're in recipes?
 

GagHalfrunt

Lifer
Apr 19, 2001
25,284
1,997
126
I've always sweated onions when making beef stew, pasta sauce, etc. But I never know why.

Sweating onions brings out the sugars, but that can easily be substituted by just adding sugar directly instead of going through the trouble of sweating onions.

So is there something else going on? Perhaps the soft onions add some sort of texture or mouth feel or thickening action and that's why they're in recipes?

You don't get the same flavor from raw onions + sugar that you get from converting starch to sugar via sweating. You also change the texture by drawing out the moisture which is done less effectively when raw onions are added to a liquid like a soup or stew.
 

renz20003

Platinum Member
Mar 14, 2011
2,714
634
136
It releases the essence of the onion. An added bonus it makes them soft.
 

JulesMaximus

No Lifer
Jul 3, 2003
74,544
924
126
I would never add sugar to a recipe that calls for onions or garlic in place of sauteing them. I'm old school though... I don't question the recipes of my ancestors.
 

Harrod

Golden Member
Apr 3, 2010
1,900
21
81
This is probably alittle off topic, but any time I use garlic I throw it in the microwave for 15 seconds to peel it easier. Does this have any negative effects on it besides slightly warming it up?
 

sdifox

No Lifer
Sep 30, 2005
98,725
17,213
126
This is probably alittle off topic, but any time I use garlic I throw it in the microwave for 15 seconds to peel it easier. Does this have any negative effects on it besides slightly warming it up?

smashing it makes peeling easy.
 

fuzzybabybunny

Moderator<br>Digital & Video Cameras
Moderator
Jan 2, 2006
10,455
35
91
I'm not talking about sauteing or caramelizing. I'm talking about sweating onions ie. on a low heat
 

sdifox

No Lifer
Sep 30, 2005
98,725
17,213
126
A sweat does not involve caramelization. When sweating an onion you don't want it to brown, you want to softly simmer it to turn translucent. It reduces moisture, softens the texture, intensifies the flavor, and removes the raw onion taste in the process.

ok. Never done that :p
 

freeskier93

Senior member
Apr 17, 2015
487
19
81
"Sugar" is refined sucrose. The sugars in onions are a mixture of glucose, fructose, and sucrose. It's just going to be a different taste and not as simple as adding sweetness.
 
Sep 12, 2004
16,852
59
86
ok. Never done that :p
It's usually done for something like a spaghetti sauce, a stew, or a pilaf where you don't want to caramelize the onions and sweeten them, and you might be sweating garlic at the same time which you don't want to brown because it can impart a bitterness to the dish.
 

sdifox

No Lifer
Sep 30, 2005
98,725
17,213
126
It's usually done for something like a spaghetti sauce, a stew, or a pilaf where you don't want to caramelize the onions and sweeten them, and you might be sweating garlic at the same time which you don't want to brown because it can impart a bitterness to the dish.

I just stir fry them
 

Matthiasa

Diamond Member
May 4, 2009
5,755
23
81
I would guess most just don't appreciate the not so mild taste of sulfur which raw onions sometimes have...
 
Sep 12, 2004
16,852
59
86
I just stir fry them
I don't own a wok because of all the Asian cuisines Chinese is my least favorite. And, yes, I've been to China and have eaten the food there. I prefer Thai and Vietnamese by a large margin, though I do have a very large soft spot for dim sum.
 

sdifox

No Lifer
Sep 30, 2005
98,725
17,213
126
I don't own a wok because of all the Asian cuisines Chinese is my least favorite. And, yes, I've been to China and have eaten the food there. I prefer Thai and Vietnamese by a large margin, though I do have a very large soft spot for dim sum.

Thai and Viet use Wok as well :awe:
 

Matthiasa

Diamond Member
May 4, 2009
5,755
23
81
if you are stewing, it's not an issue.

Not always, I have had onions ruin things when not sweating, or caramelizing them first. That flavor can linger on for quite a while and is definitely not pleasant.
 
Last edited:

guachi

Senior member
Nov 16, 2010
761
415
136
Big fan of sweating onions.

The only thing I'll crank the heat up on an caramelize onions is making tacos as I want the onions to have some extra flavor to stand up to the spices.
 

Linux23

Lifer
Apr 9, 2000
11,370
741
126
While you're sweeting the onions, throw in a dash of your own sweet. Makes everything more Yummy!