In China: Hunanese mostly. 农家炒肉 being my, as wankers would say, ‘go to’ dish. No particular place, Beijing is full of migrants from other provinces with small restaurants/takeaways.
In UK: to be honest the only takeaway/delivery I crave that I cannot make myself is proper pizza done in a pizza oven. So, local pizza (Neapolitan not seppo style).