Step

• 1

  When ready to cook, start the Traeger grill and set the temperature to 375 degrees F and preheat, lid closed, for 10 to 15 minutes.

• 2

  Place a large cast iron pan in the Traeger and allow to preheat for 10 to 15 minutes. Slice onion in half and then into to 1/4 inch half-moons.

• 3

  Put a teaspoon of olive oil in your preheated pan along with a half tablespoon of butter and coat bottom of pan.

• 4

  Add onions, sprinkle with a pinch of salt and pepper and close lid. Cook for 40 minutes stirring every 10 minutes until onions are a rich brown color.

  375 ˚F / 191 ˚C

  00:40

• 5

  Remove onions from grill and turn temp to 500F. Wipe out pan or use cast iron griddle and place in grill to preheat for 10 to 15 minutes.

  500 ˚F / 260 ˚C

• 6

  Take 2 slices of bread and butter the sides that will be touching the pan. Spread a thin layer of mustard and mayo on the other side of bread.

• 7

  Add 2 slices of each cheese and then top with the onions.

• 8

  Place your sandwiches in the preheated pan or on griddle and close lid. Grill for 8 to 10 minutes per side or until well browned and cheese is completely melted.

• 9

  Remove from grill, slice in half into triangles and serve immediately. Enjoy!