I do a standard salt brine. Thats the cool thing about fermenting, the ingredients are totally up to you. Imo kimchi is meh. Do your own thing. Start simple and add stuff until you find a winner.

My first one was:

2 cans pickled beet (keep juice in)

Sliced jalapeños (leave more seed for +spice lvl)

Brine water

After 3 days I added some whole boiled eggs to the mix.

*Let them sit in the fridge after eggs are added.

Gives the eggs a nice spicy flavor and turns them bright purple.

Just to be clear, The boiled eggs do not ferment. They just sit in the ferment mix haha.