Vegetables are rich of nutrients: choose the best one (seasonal, local, organic) and eat them raw or steamed
Vegetables are rich in vitamins, minerals, fibre and phytonutrients (natural chemicals produced by the vegetables with e.g. antioxidant and anti-inflammatory properties)
Especially the raw one, because cooking reduces them. The healthiest cooking technique is steaming.
If possibile, choose organic, local and seasonal vegetables.
Find out the nutritional properties of your vegetable on this site https://naehrwertdaten.ch in EN, IT, FR, DE.