Step 1

Preheat your Traeger to 400°F-450°F. Put a cast iron pan into the grill while it preheats.

Step 2

While the grill is preheating, season your steaks. If you don't want to make up your own beef rub, you can use whatever you have on hand, or a mixture of salt and pepper.

Step 3

Put the olive oil into the preheated cast iron pan and toss in your sliced onions. Close the grill and let them cook a bit, but stir frequently so they don't burn. You want them browned, not black.

Step 4

Once the onions are done, put your steaks on the grill. Grill on both sides until the internal temperature reaches 125°F-130°F. Also consider grilling your bread at this point too. You want the cut side toasty.

Step 5

When the steak is done, remove from the grill and let rest.

Step 6

Mix together the aioli ingredients and spread over both sides of your toasted bread.

Step 7

Slice the steak across the grain and load it up onto the sandwich. Top with the smoked cheddar and caramelized onions and finally the top half of the bread. You can wrap in foil and put it back on the grill if you care about the cheese being melted. If not, just cut it into manageable chunks and enjoy!