Doenjang falls into Mashed Potatoes


Doenjang, the funky-chunky-fermented-aged Korean soybean paste, has an exceptionally robust umami profile. Umami is the savory taste and round mouth-feel imparted by glutamate and nucleotides in certain foods.

In 1908, the complex flavor and deliciousness of dashi, a simple Japanese soup base made from seaweed intrigued a chemistry professor at Tokyo Imperial University. Upon investigation, Dr. Kikunae Ikeda was able to isolate the principal flavor ingredient of kombu (the kelp used to make dashi). Using classical chemistry procedures he identified this substance as glutamic acid.

Glutamic acid is a type of amino acid, which are the building blocks of proteins. Bound with minerals such as sodium, potassium, or magnesium – glutamic acid becomes glutamate, a salt. It is the salt form of glutamic acid that elicits the taste. Following Ikeda’s glutamate discovery other foods were determined to be sources of umami and that the process of fermentation forms and releases amino acid and nucleotide compounds as well.

Doenjang is made from dried soybeans which are boiled and stone-ground into a coarse paste, then formed into blocks called meju and allowed to ferment with the help of warmth or sunlight and bacteria. One to three months later, the blocks are placed in large pottery jars and covered with a very salty brine as the fermentation process continues.  At the end of the process the liquid is filtered off, this liquid is Korean soy sauce called ganjang, and the remaining solids are our salty-earthy-complex-umami rich paste with a pungent aroma called doenjang.


Doenjang된장 Mashed Potatoes Recipe Potatoes:

  • 5 yukon gold potatoes, medium-size
  • 4 t. doenjang
  • 3 T. unsalted butter



  1. Peel and slice potatoes into a manageable size to put through a ricer.
  2. Cover with cold water and cook until potatoes are tender.
  3. Drain in a colander, letting steam escape.
  4. Fill the bowl of a ricer with potatoes and one teaspoon of doenjang.
  5. Press the potatoes through the ricer, repeating as necessary, about four times.
  6. Gently fold the riced potatoes and doenjang together.


Seaweed Seasoning:

  • 1 sheet of roasted seaweed
  • 1 t. black sesame seeds
  • 1 t.white sesame seeds
  • 1 t. gochugaru (Korean red chili powder)
  • fresh ground black pepper



  1. Pass a sheet of roasted seaweed over the flame of an open burner on a stovetop, quickly, so it roasts but does not catch fire.
  2. Tear the sheet into smaller pieces and place in the bowl of a food processor.
  3. Add sesame seeds, gochugaru, and black pepper.
  4. Pulse briefly so the seaweed is chopped into smaller bits.
  5. Top the potatoes with semi-melted butter (lots of it) and seaweed seasoning.
  6. Enjoy super-savory, earthy, umami-rich mashed potatoes.
  7. Top the potatoes with semi-melted butter (lots of it) and seaweed seasoning.
  8. Enjoy super-savory, earthy, umami-rich mashed potatoes.