Raw onions bring much-needed pungency to sandwiches and salads, but sometimes they’re a little too good at their job, and their aggressive flavour overwhelms the rest of the meal. If you find yourself with a particularly intense onion, all you need to tame it is a little salt.
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Salting sliced onion before adding it to a sandwich (or salad) does two things: Seasons and softens. It draws out moisture, making the slices more pliable, while brining them in their own juices for a kinder, gentler — but still oniony — onion.
Just slice your onions as you normally would, sprinkle with enough salt to barely coat them, and let them hang out for five or 10 minutes until they reach your desired pliability (the longer they sit, the softer they become).
If your onion is just slightly overwhelming, and you still want to keep some of the crunchy texture, salt half of them, then toss both halves together before plating.