Shredded celery is a tasty replacement for high-carb staples such as potatoes, pasta, and rice, and it has fewer calories than other foods that that is also true of, such as spaghettified courgette and celeriac.  But it doesn't shred well in a spiraliser, not being as hard as celeriac or as well-behaved as courgette. And a grater will turn it almost to pulp. The best way I have found so far is to use a julienne mill, but that tends to shred not hugely more than half of the celery I put in, leaving the rest in large soggy lumps.  I would like to make "celeretti" with long strands similar to "courgetti". But I would like to do it with celery sticks, not with celeriac. Whereas celeriac has about two and half times more calories per 100g than courgette, celery has about the same amount.  Suggestions? 
A food processor works well. Just fill the bowl lightly so that you can watch what happens as you do quick pulses. Use the metal blade.  Slow short pulses. It also helps if the meat is really cold but not frozen. Yum. 