Place trout on large piece of foil. Rub inside and out with butter, salt, basil, and red pepper. Add sliced grapes and mushrooms. Wrap carefully. Place wrapped fish on another large piece of foil and wrap again. Insert into hot part of engine.
Bake on warm (running) V8 engine (4.0 litre preferred) for approximately 30 minutes or 20 miles on road or 2 laps around the 80 acre off-road course or 1 successful ascent of Bear Mountain Trail. Carefully unwrap fish and enjoy. Usually this is a meal on its own, but you can serve it with something else off the tailgate if you would prefer.
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