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And to get evenmore quercetin, we can add more of these things to our diet:

Quercetin is the most abundant flavonoid in the diet. It’s estimated that the average person consumes 10–100 mg of it daily through various food sources. Foods that commonly contain quercetin include onions, apples, grapes, berries, broccoli, citrus fruits, cherries, green tea, coffee, red wine, and capers.

Flavonol compounds quercetin, kaempferol and myricetin are widely prevalent in vegetables. Particularly good sources are onions, hot peppers, kale, broccoli, rutabagas and spinach. Onions, lettuce, tomatoes, celery, hot peppers, spring onions, and broccoli are also major contributors of flavonol compounds to the diet.

Quercetin is contained in abundance in apples, honey, raspberries, onions, red grapes, cherries, citrus fruits, and green leafy vegetables. Among vegetables and fruits, quercetin content is highest in onions.