The reasons sweet onions taste so sweet is they have less sulfur and thus less pungency than other onions, which makes you able to taste all the sugar naturally in onions (the sugar that gets coaxed out as you cook them slowly into caramelized onions, for example). Since sweet onions aren't as pungent as other onions, they are not best used in place of regular onions as aromatics in recipes. If you do so, the results will lack that underlying oomph of flavor onions usually provide. The mild flavor of sweet onions makes them perfect for using raw in salads and relishes or chopped as a garnish. Want to cook them? Sweet onions are lovely when turned into onion rings or when simply roasted. This is a product of British Columbia and Washington.

Available in 2.5 & 5 lb bags 

Bulk buy: 20 lb $40 

Source: https://www.thespruceeats.com/all-about-sweet-onions-4094058