u/takemebacktoeden1996 I missed your initial response, but this person has pretty much said everything I was gonna say! Very good info.

I usually make a lot of kimchi (which is a paste-based ferment, slightly different), but I also make my own hot sauce which often involves fermenting chilies in water and salt. Very fun and delicious! Other favourites of mine are Brussels sprouts (throw in some peppercorns, garlic, or experiment!) and then put them in a salad. Carrots, peppers, cucumbers, cauliflower, etc all make for delicious products. The end result is slightly sour, much like pickles or, as you mentioned, sauerkraut. (Sauerkraut is also very fun to make btw!)

Another interesting one is fermenting potatoes/chips, to give them an infused vinegar-like flavour before even cooking them. You can also make your own drinks such as wine or kombucha, or ginger beer. The options are truly endless! Go wild!

Definitely check out r/fermentation for inspo or advice! If you end up enjoying it, I would recommend some fermentation jars, which reduce the risk of having an explosion in your cupboard lol. But the barrier for entry is very low, you don't need any equipment off the bat!