Wash sesame seeds and walnut. Drain.

Toast walnuts and sesame seeds in frying pan over medium heat for 15-20 minutes until fragrance is released.

Blend ingredients in a blender with 2 cups of water for 3-5 minutes until creamy.

Strain mixture through a fine sieve. Blend the contents of the sieve a second time with another 2 cups of water.

Cook all together with sugar on low heat, stirring continually until the mixture bubbles and thickens for about 10 minutes.