Ekkamai's 60-year-old beef noodles specialist Wattana Panich (336 Ekkamai Soi 18, 02-391-7264. Open daily 10am-8pm) still uses the same soup at when it moved to its current premises 40 years ago.

The B100 bowls are made from an old family recipe and attract all walks of Bangkok life, from Sukhumvit socialites to taxi drivers and tourists.

Watch our video to find out the secret to this old-school beef stew: