01 -
Get rid of any extra fat or silver skin on the steaks. Coat lightly in oil, then sprinkle generously with salt and fresh pepper on all sides. Use more seasoning if they're thick cuts.
02 -
Wrap them tightly in plastic wrap and put them in the fridge for a while to soak in the seasoning.
03 -
Heat butter in a small pot over low heat, stirring constantly. Gradually mix in garlic, lemon zest and juice, mustard, and all the dry spices.
04 -
Take off the heat before stirring in fresh parsley and chives. Adjust salt and pepper if needed. Set a small amount aside for grilling, and save the rest for the buns later.
05 -
Heat the grill to medium-high, leaving a cooler area for indirect heat. Take the steaks out of the fridge and leave them at room temperature for 30 minutes.
06 -
Sear steaks over direct flames for 2-3 minutes per side without burning them. If flames get too high, move the steaks to the cooler section. Baste both sides with cowboy butter while grilling. Shift to indirect heat after 5-6 minutes to finish cooking to your desired doneness.
07 -
Place the steaks on a plate, cover lightly with foil, and let them sit for 10 minutes before cutting.
08 -
Melt a few tablespoons of butter in a skillet placed on the grill over direct heat. Toss in the onion slices and cook for about 15 minutes, stirring now and then, until soft and caramelized.
09 -
Set your oven to broil and line a baking sheet with parchment paper.
10 -
Split open the buns, coat both sides with cowboy butter, and layer havarti cheese on each half. Add the grilled onions to the bottom buns.
11 -
Lay a few strips of steak on each bottom bun. Broil for 1-2 minutes until the cheese melts a bit, then place the top bun over. Cut and dig in!