White Onions – These onions tend to have a sharper and more pungent flavor than yellow onions. They also tend to be more tender and have a thinner, more papery skin. Red onions are most often used in salads, salsas, and other raw preparations for their color and relatively mild flavor.

One may also ask, can I substitute yellow onion for white onion? Yellow is the ideal variety for caramelizing. When you are sauteing onions to build flavor as a base for your dish (soup, tomato sauce, you name it), the yellow onion is your friend. That being said, white onions are a totally acceptable substitute for yellow, especially if youre cooking them.

One may also ask, what can I substitute for a Red Onion?

use yellow onions to substitute red onions.

Are red onions milder than white?

Youre most likely to see red onions in non-cooked dishes, such as salads and sandwiches. Of the different colored onions, the red onion is the most mild, sweet onion. Red onions have the purplish-red skin which color is layered though its white flesh.