I smoked some burgers tonight for dinner and they got rave reviews around my house. Very simple to do and they turned out great for my first attempt.
Ingredients: 4 lbs. ground sirloin, 1/2 cup Quaker oats, 3/4 tsp. garlic powder, 1 teaspoon lemon pepper, 1/2 teaspoon Lowry's seasoned salt, 2 tablespoons dried onion flakes. I don't measure ingredients very often when I cook so adjust these to suit your taste.
Mix all ingredients together and shape into patties. I only made 8 because we like thick burgers and they were about 1" thick.
I smoked them in my Mod. 55 at 225 degrees for 1 1/2 hours using the top two racks, with the smallest chunk of hickory in the box. It was only about 2" x 2" x 1 1/2" and I wouldn't use any more . In fact I would use less if you don't want a very pronounced hickory taste. Burgers were done all the way through gray inside with a pinkish outside from the hickory smoke.
Everyone said it was the best burger they had eaten and like most people we have eaten lots of them in our day. With 5 racks I could easily do 20 of them at a time and nobody, not even me, at more than one.