The other experiment was stir-frying tuna with whole unpeeled lime slices. The result was somewhat bitter and I won't be doing that again. One of my friends *likes* bitter, and he'll probably try it out for himself.
One of the lime slices escaped under the pan, and got lightly toasted by the gas flame. This was actually nice--the cooking seemed to sweeten the lime a bit, and the crispy peel was nice to handle, though I didn't try eating it.