You can try Kway Chap at Block 284 Bishan Street 22. Opens from 8.30am till 4am. They are off on every alternate Sunday. I really like their kway tiao and the soup is drinkable! You can order fishcake, preserved salted veg, taupok, pig's skin, pork belly, big intestine head, big/small intestine. Take your pick! I love their big intestine head! They braised it until so soft and no porky taste!