I live in Denmark, Europe and I have in my garden this gigantic vegetable.
It has a big bump on the top and i was wondering about what comes out of it?
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Can't put any more comments, thread's too long. I think this plant is Elephant Garlic, or Allium ampeloprasum. The thing on the top is going to be a flower, usually pink - the part most people are interested in is what's under the ground, the garlic bulb, which should be very large. And yes, you can harvest the bulb and use it to cook with. Leaves and flowers are also edible, but will become tough if not picked young.
If you want to harvest the bulb, dig up the plant and lay it sideways, chop off the leaves and stem, leaving about an inch or two of stem attached to the bulb, and hang it up till it dries out.
Leek is Allium porrum - it may be that the 'pore' you speak of is taken from the last part of the Latin name for that particular vegetable.