I use a cheap mini food processor for small tasks such as this - ones where my full-size gear would just be too big & I'd either lose most of it round the edges or it would just go underneath the blades & I'd spend all my time bouncing it up & down trying to get it to work on such a small quantity.
Small batches, but you only need to rough chop initially, so time is saved overall. It will chop really finely, but doesn't go on to liquidise unless you really go overboard.
Asda, 8 quid [ten bucks or so] No clue what make it is. Plenty powerful for its size.
Hand-held so you can estimate its size.