First, chop and blanch all the leaves. This helps to kill any germs and also to soften the leaves, which are a bit chewy. Leaves can also be stir-fried.
While the leaves are blaching, gather the ingredients for the kimchi. Here I have used a fresh onion from the garden. You will also need garlic, anchovy and/or soy sauce, ginger, and red pepper to taste. I also optionally added some dehydrated tiny shrimp, but that's because I have them and they need to be used up.
Placed the blanched leaves in cool, salty water and let sit for at least an hour. Here I have weighed down the leaves with a plate and a jar.
Then rinse all the salt from the mulberry leaves, and toss with sauce ingredients. Pack into a jar or two, and place in the refrigerator.
The longer this ferments, the more discolored it becomes, so it recommended to eat fresh or with the first couple of weeks. Enjoy!