Most adults rotate through 5-8 vegetables — same ones weekly. Trying one new or rarely-eaten vegetable weekly expands palate and microbiome diversity (target: 30+ different plants weekly).
What to try today
Vegetable you've ignored at supermarket. Foreign-cuisine vegetables you've encountered in restaurants. Heirloom variety of vegetable you usually eat. Foraged or seasonal item.
Where to find ideas
Farmers market. World cuisine cookbooks. Recipe blogs in different cuisines. Asking elderly relatives what they ate growing up.
Five new vegetables tried over five weeks expands what you eat substantially. Most adults discover 2-3 new favourites in any year.