Heat up 1/2 tablespoons of sesame oil in a small pan and fry the Tian Mian Jiang over slowest fire for 2 minutes.
Pour in water and add sugar in and sesame paste. Keep slow fire and continue mixing until well combined. You can continue heating if you prefer a thicker texture. Turn off fire and mix with sesame oil and five spice powder.
The sauce should be thick but also running and it can be kept in fridge for 3-4 days. You can also use the sauce to make Peking style pork stir fry.
Notes
The Nutrition facts of Tian Mian Jiang is just roughly calculated. If you plan to make it simply as a dipping sauce, you can add extra 2 tablespoons of water to make the sauce a little bit running.