Line two rimmed sheet pans with foil. Heat the pellet grill to 300F degrees.
Add the tomatoes, cut side up, onto one sheet pan. Drizzle with olive oil, and 1/2 teaspoon of salt and pepper.
On the other sheet pan, break up the ground beef and sausage and spread it out. Sprinkle the onions and garlic on top.
Place the pan of tomatoes on the smoker and smoke for 1 hour.
After 1 hour, place the pan of meat on the smoker next to the pan of tomatoes and continue smoking for 45 minutes.
Peel the skins off the tomatoes and discard. Place the peeled tomatoes into a large bowl. Use an immersion blender or fork to break up the tomatoes.
Stir in the tomato sauce, tomato paste, beef broth, Italian seasoning, and remaining salt and pepper.
Break up the meat with your hands and add it to the bowl. Stir to combine.