In Japan, there are many Halal food shops to serve muslims in this area (from Bangladesh, etc). 

These common shops offer a selection of varied goods - not ony ingredients for cooking, but also sometimes prepared food and  general cultural goods as well (which are otherwise hard to come by in Japan). 

I tagged it as shop=food + diet:halal=yes, But shop=halal or shop=diet (with diet:*=* defining the specific clients served) might be a better description of these kinds of shops that serve people with a special diet of some type, rather than meat, greengrocer, etc.