Roadside icecream in Asia is quite hazardous. I would in general eat only very hot cooked food (165F or 74C, inside and outside) while in Asia, thereby ensuring the germs are dead. Stick to boiled or sealed bottled water. Despite the food being hot, it can still sometimes contain bacterial toxins or mycotoxins. Avoid salads while outdoors almost anywhere. Also be careful with the choice of fish to avoid any potentially toxic fish, e.g. reef fish.