Tomatoes, cucumbers, and onions are a Holy Trinity of sorts for salads. They'll liven up almost any plate of greens with ...

Choose fresh and high-quality ingredients: Use firm and ripe tomatoes, crisp cucumbers, and onions with a mild flavor.

Put the cucumber and the onion in a bowl and toss in the salt, then shake the bowl to distribute it evenly. Cover with a piece of baking paper and weigh down with a plate. Set aside for at least ...