What are these bulbous seedlings?

in Fruit & veg
I've got these seedlings popping up all over the garden. At first I thought it might be a leek because I left a giant leek go to seed but the base is clearly round. I also grew shallots (didn't think any went to seed) and onions. Maybe it isn't a veg at all. If anyone recognises it it will help me decide what I should be doing with them. 

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Looks like a shallot but I'm prepared to be corrected!
The foliage is narrow on them - just like that pic
I live in west central Scotland - not where that photo is...