The leek is a vegetable, the broadleaf wild leek. Leeks come from the same family as onions and garlic, and offer similar health benefits.
Leeks contain up to 16% inulin fiber and thanks to their inulin content, leeks promote healthy gut bacteria and help in the breakdown of fat and are often used in cooking for their distinct flavor. They are high in prebiotic inulin fiber and vitamin K.
Onions are vegetables that grow as underground bulbs at the base of plants known scientifically as Allium cepa. Also known as bulb onions or common onions, they are grown worldwide, and are closely related to chives, garlic, scallions, shallots and leeks.
Onions may have several health benefits, mostly due to their high content of antioxidants and sulfur-containing compounds. They have antioxidant and anti-inflammatory effects, and have been linked to reduced risk of cancer, lower blood sugar levels and improved bone health.
The taste can vary from mild and sweet to sharp and spicy, depending on variety and season.