Exactly this except I like cut 50/50 with corn meal.
Fresh from a stream in the Sierras or high mountains of your choice, 6"-8" long, gutted, heads on, shaken in a bag with bisquick and seasonings, fried in leftover bacon grease or if not enough grease to fry, spread some on some foil and wrap the fish and put it in the coals.
We didn't bring the extra weight of cornmeal on 9 day backpacking trips. Bisquick was used for dumplings on top of Mountain House stews, pancakes to go with the DAK canned bacon (used the empty can to store the bacon grease in for later cooking of the trout) and biscuits of course.
At home, cornmeal makes for a nice touch though.