The red onion is one of the many staple ingredients in every cuisine today. The scientific term for red onion is Allium Cepa. Red onions have a skin with a purple and red mixed colour. This skin, though not included when you’re cooking the onion, is being used by manufacturers as a dye for fabric productions. Unlike its relative varieties of yellow and white onions – the red onion is the kind that contains a powerful chemical agent that can irritate your tear ducts.
The red onion, though not directly related, is more similar to shallots. It is the essential ingredient that gives any dish a kick of spiciness. For salads, you can interchangeably use onion and shallots as they both taste sweet and spice, but only with different intensities.