Three-cornered leek

There is a profusion of this plant outside my garden gate. Although described as a leek and tasting of chives, it has an overwhelming aroma of garlic.
All of the plant is edible. The young plants can be uprooted when found in profusion and treated as baby leeks or spring onion, the leaves and flowers can be used in salads or the leaves in soups or stews, the more mature onion like roots can be used as onion or garlic.