How to make gochujang at home the traditional and authentic way. It is a lot of work but will be nothing like the ones you buy at the stores.
The sun helps to kill any fungus from forming on top. Cover the top with a fine mosquito net or mesh that will keep the bugs away but let the sun in. Tie the net with a string so it stays put. Cover with a lid when it rains and at night time to keep moisture out.
Please check out my blog post for more details on how to sterilize the pot 1-2 days before.