Peel Korean radish(es) with a peeler. Quickly rinse them to remove any dirt. Some Koreans leave the skin on for texture and nutrients. If you want to leave the skin on, wash thoroughly using a scrub before using.
3 lb Korean Radish
Cut the radishes into bite-sized cubes (¾” x ¾” x¾” or 2cm X 2cm X2 cm).
In a large bowl, throughly mix the coarse salt with cubed radishes. Let it sit for about one hour. During the one hour, mix it around at 30 min mark so that the radishes are evenly seasoned. (The colder the temperature, the longer the brining time.)
3 tbs Coarse Sea Salt
Wash the seasoned radishes in a large bowl of water 1-3 times (depending on the saltiness), each time with fresh water. At this point, if you taste after washing, should be a tiny bit saltier than you like. The saltiness will decrease as they get fermented later. If it’s extremely salty, you can soak in water for a while until desired to saltiness.
Leave them in a strainer for at least 1 to 2 hours to drain water out completely.
Mix sweet rice flour (or regular flour) with COLD water. Stir until there are no lumps. (If you are making a large amount, use some water to mix with flour and boil the rest of the water. Then, add the mixture to the boiling water. This way you don't have to stir for a long time.) Cook on medium heat while stirring until it reaches “cream soup like” consistency. Take it off the heat and let it cool completely.
1½ tsp Sweet Rice Flour, ½ cup Water
Add gochugaru (hot pepper flakes) into the flour soup. (If you can’t take very spicy food, reduce the amount of gochugau. Mix well. Leave it for about 20 min to get more vibrant color (optional). If you leave this gochugaru and flour soup mixture in the fridge overnight, it can improve color and taste but not required.
⅓ cup Gochugaru
In a medium bowl, mix all remaining ingredients (salted shrimp, green onions, minced garlic, minced ginger and sugar) into the gochugaru paste. Taste and add some salt as needed ONLY IF your seasoning is not salty enough you can add some salt (because salted shrimp saltiness may vary depending on the brand OR if your brined radish is not salty enough)
2 tbs Salted Shrimp (Sae Woo Jeot), 3 Green Onion, 1 tbs Sugar, 4 tsp Garlic, ½ tsp Ginger, 1/4 tsp Coarse Sea Salt (OPTIONAL)
In a large bowl, throughly mix the radish cubes with the seasoning. Don’t pour all the seasoning at once in case there is too much seasoning for the amount of radish.
Place them in a container with a good seal. Fill only 85% of the container and place a tray below the container. It can overflow as it produces liquid while fermenting. Once the container is filled, use your hand to pat down on kimchi so that it is tightly packed in the container.
Cover the top with a plastic sheet (cling wrap). Close the lid. If you are making a small amount and will be eating it in a week or two, you don’t have to cover with a plastic sheet. The plastic sheet keeps the air out so it reduces a chance of getting molds. Alternatively, you can use a specialized kimchi container or fermenter with a vacuum seal. Leave it out in room temperature for a day or two for proper fermentation then into the fridge. If you want to eat it soon you can leave it at room temperature until it has a sour taste you like. We left out in room temperature for 4 days before eating it.
After they are fermented, keep them in the fridge.
Serve COLD as a side dish (usually 5-10 pieces per person).