It's a versatile dish that I love making as you can add so many things to the batter. Grate up carrots, slice up mushrooms, or thinly cut some cabbages to go into the batter. Kimchi is another great addition. Haemul pajeon is the seafood version of this so if you have shrimp, mussels, oysters, clams, etc. feel free to add that as well. Just be sure to chop them up into bite-sized pieces.