Mix all ingredients together in a large bowl (other than basting ingredients). Place in a 9 x 5 inch loaf pan. (You might think you have too much meat but mound it in the pan.) Cook on grill (indirect heat) approximately 1.5 hours until internal temperature reaches 140 degrees.
Combine a mixture of 3/4 parts tomato sauce and 1/4 parts ketchup in a small bowl. Spread over meatloaf and continue cooking on Big Green Egg for an additional 15 minutes until internal temperature reaches 160 degrees.
Notes
The original recipe was written for a regular indoor oven at 350 degrees, with baking times of 1.5 to 2 hours until meatloaf pulls away from pan. If you cook in the oven, place on top of a cookie sheet to avoid spills.