Ordinary onions might grow in a large-ish container, but spring onions should be OK. You can get varieties of carrot that are specifically designed/bred for containers - usually the smaller ball-shaped ones, though there's at least one variety I've seen (forget the name, alas) that's very long and thin, so you can grow it in a bucket or similar. Tomatoes, as you've spotted, are excellently suited. I haven't tried potatoes in a bin, but they apparently do work - about a foot of compost in the bottom, then the seed potatoes, covered, and just keep adding more soil/compost as they grow up through till the bin is nearly full.
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