Oh, I don't know. My wife made them. There was probably a little mayo in there or egg or something to hold the patty together, and a smattering of corn kernels and a dash of herbs.
Edit:
Here's a recipe that looks similar, except we don't typically have cress leaves, so the herb was probably something else.
Edit 2: Oh, and ours was fried, and not served on a rice cake. So really that recipe was nothing like ours.