Cuban restaurants pretty consistently have low-carb menu items, if that is your only restriction. The next best alternative in my experience is Mexican restaurants with careful ordering (e.g. Chipotle burrito bowl, no beans, no rice). Indian (and Thai and others I assume) curries are often low-carb, but are not nearly as good without naan or rice.
Cuban restaurants pretty consistently have low-carb menu items, if that is your only restriction. The next best alternative in my experience is Mexican restaurants with careful ordering (e.g. Chipotle burrito bowl, no beans, no rice). Indian (and Thai and others I assume) curries are often low-carb, but are not nearly as good without naan or rice.