To mellow the sharpness of onions in raw dishes, soak them in cold water, vinegar, or lemon juice for 10-15 minutes before using. This process reduces the sulfur compounds that cause their pungent flavor.
Raw onions contain sulfur compounds that are released when they are cut, leading to their sharp, sometimes overpowering taste. Several methods can be employed to reduce this sharpness and make them more palatable in salads, salsas, and other raw preparations.
1. Soaking in Cold Water: Submerge the sliced or diced onions in a bowl of ice-cold water for about 10-15 minutes. The water helps to draw out some of the sulfur compounds, making the onions milder. Drain them thoroughly before adding them to your dish.
2. Vinegar or Lemon Juice: A brief soak in vinegar (white, apple cider, or red wine vinegar all work) or lemon juice can also temper the onion's bite. The acidity helps to break down the sulfur compounds. Use about 1-2 tablespoons of vinegar or lemon juice per onion and soak for 10-15 minutes. Rinse lightly with water afterward if desired.
3. Salt: Sprinkling the cut onions with salt and letting them sit for about 10 minutes before rinsing can also help to draw out moisture and reduce their sharpness. Be sure to adjust the salt in your recipe accordingly.
4. Choosing Milder Varieties: Opt for milder onion varieties like red onions, Vidalia onions, or shallots, which naturally have a less pungent flavor than yellow or white onions.
Always taste the onions after mellowing them to ensure they have reached your desired level of mildness. You can adjust the soaking time accordingly. Over-soaking can make the onions bland, so start with a shorter soak and increase as needed.