Oh my goodness. I was already a card-carrying meatloaf addict before cedar plank meatloaf came into my life. Now, my meatloaf obsession is completely out of control.
Fire up your grill for direct and indirect cooking.
Remove the plank from the water and sear it on both sides over the flame. Get a nice char on it but don't burn it. Place on a large baking sheet and set up your grill for indirect cooking between 350-400 F.
In a large bowl combine the remaining meatloaf ingredients.
Transfer the meat mixture to the plank and form into a loaf.
Transfer the plank to your grill over indirect heat. Cook for 45 minutes.
Pour the topping over the meatloaf and spread out with the back of a spoon.
Continue cooking until the meatloaf reaches at least 160 F, testing the temperature in the thickest part of the loaf.