Highway 4, named after the highway that winds through the mountainous north of the country, has created a niche for itself in Hanoi as a restaurant serving innovative Vietnamese cuisine as well as a wide range of drinks that includes its own brand of Son Tinh liquors. It has become so popular that there are now several branches around the city, and it makes a great choice for an evening out with friends. The design of the dining areas is well thought out, with a choice of sitting at regular tables or on floor cushions at low tables, and the friendly, efficient service keeps customers satisfied. The Sinh Tinh liquors are claimed to be hangover-free due to the superior distillation techniques and lack of additives, so order up a passion fruit liquor or another of the exotic concoctions and put the theory to the test.