The Bath
Let meat soak in water for an hour, changing water three times.
Next I soaked it in a stiff brine of salt with water for a good 2 hours. Longer would have been better.
Rinse very well and dry with paper towels.
The Prep
Remove the veins from the heart and attached faty looking material from the kidneys
Slice and dice the meat Freddie Kruker style, particularly the fat cap on the heart.
Slather yellow mustard and rub it into anything you can rub it into. It's good to have an adult supervisor at this point.
Turn the meat over and apply rub to the bottom first. Once you flip it back up you can apply a heavier dosage of rub to the top, being sure to work the rub into all the slice marks you made.
The Smoking
Preheat smoker to 225 degrees
Place roasts in a half tray to catch the juices or on a rack with a catching tray underneath. There will be a lot of juices.
Cook to 170 degrees internal temperature for well done (about 5 hours)
Remove, let sit, carve.
I'm a bit squeemish of juices coming out of a kidney so I reserved the tasty drippings for the dogs this morning.
It was good. Just the right flavor. What I tasted was a bit of the yellow mustard (nothing unpleasant) and a mild rub that enhanced the flavor of the meat. The meaty taste was different than any other beef I've tried. It kind of reminded me of the lunchmeat my dad used to put on his sandwiches when I was growing up.
I'll give it 3.5 out of 5 Stars. I think I overcooked the heart but the kidney was perfect in flavor and tenderness. Maybe hearts are naturally tougher. I don't know but I will try again.