Onions are chock-full of healthy nutrients and plant chemicals, phytochemicals, that promote health and fight disease. One specific phytochemical group are polyphenols which contain a sub-group known as flavonoids. A specific flavonoid, quercetin, is among the most widely occurring polyphenols in nature.
Onion is known to have the highest quantity of quercetin. Quercetin has anti-oxidative, anti-inflammatory, anti-carcinogenic, anti-diabetic, and anti-viral properties. The molecule can cross the blood-brain barrier, (BBB) to protect against neurodegenerative diseases.
Onions and other members of the allium family (bulbous plant that includes onion and its relatives), such as leeks, shallots and scallions, may protect against the development of high blood pressure, heart disease, high cholesterol and other conditions. Red and yellow onions have the highest flavonoid content.
Idea: Pickle them. Very thinly slice 1 red onion with a mandolin. Place them in a mason jar. Set aside. In a small saucepan, whisk together 3/4 cup organic apple cider vinegar, 1/4 cup water, 1 tsp sea salt and 1 – 2 TB honey or sugar. Cook over medium-high heat until mixture reaches a simmer. Pour the mixture over the onions, screw on the lid and shake to coat the onions. Let marinate for 30 minutes, occasionally pushing the onions down into the liquid with the back of a spoon.