Preheat your Traeger Ranger to 425* and place grill grates in the grill. Allow the grill to get very hot.
While the grill preheats, prepare the lamb chops by patting them dry with a paper towel after unwrapping them.
Season the chops all over with my Smoke Junkie seasoning and allow the meat to sweat for 5-10 minutes.
Cook the lamb chops on the preheated grill, creating strong grill marks.
To get an excellent grill-mark grid, turn the meat 90* while cooking on one side, which will give you a grid.
Grill the lamb chops on one side for about 5-7 minutes, then flip and repeat.
Continue cooking for 5-7 minutes on the second side until grill marks are achieved and the interior temperature of the meat reaches about 135*.
Pull the chops from the grill and tent loosely with foil on a plate.
While the meat rests, create the pan sauce.
In a small skillet, saute 2/3 of the butter with the finely chopped onion and crushed garlic until just translucent, about 3 minutes.
Stir in the prepared horseradish sauce, then the sugar and the whole blackberries.
Cook for 2 minutes on medium heat, and then add the wine and bring to a quick boil.
Using a spoon or spatula, gently crush or cut the berries into smaller pieces.
Continue cooking for 2-4 minutes until the wine reduces slightly.
Remove the sauce from the heat of the stove and stir in the remaining 1/3 of the butter until smooth.
Arrange the grilled chops on a serving platter and top with the blackberry pan sauce.
Serve your Traeger grilled lamb chops with blackberry pan sauce immediately and enjoy!