When you soak an onion in a mixture of cold water and one tablespoon of baking soda, it can neutralize the sulfur and lessen the boldness, just be sure to wash off the baking soda. Another trick to soften the onion’s bite is to let the onion sit in salad dressing or icy water for 10 to 15 minutes, or you can also try rubbing kosher salt into the onions to lessen the taste.