-
1
Using the tines of a fork, poke holes in potato all over. Place potato on a plate and microwave on high until a paring knife can be inserted in middle of potato with no resistance, 9 to 12 minutes, checking and flipping the potato every 3 minutes. Alternatively, place potato in 425u00b0F oven and cook until a paring knife can be inserted in middle of potato with no resistance, about 1 hour. Split potato open and allow to cool slightly, 5 to 10 minutes. Using a spoon, scoop out flesh in a small bowl, discard skin.
-
2
Melt butter in a small skillet over medium heat. When foaming subsides, add onion and celery and cook, stirring occasionally, until softened, 5 to 7 minutes. Stir in sage, thyme, and garlic and cook until fragrant, about 30 seconds. Remove from heat and let cool for 5 to 10 minutes.
-
3
Place turkey, sausage, 1/4 cup sweet potato flesh, and vegetable mixture in a medium bowl and mix with hands until incorporated. Form mixture into 4 patties. Season with salt and pepper to taste.
-
4
When all the charcoal is lit and covered with gray ash, pour out and spread the coals evenly over entire surface of charcoal grate. Set cooking grate in place, cover grill and allow to preheat for 5 minutes.
-
5
and
-
6
the grilling grate. Grill burgers over direct heat until an instant read thermometer reads at least 145u00b0F in the center of burger, but no more than 165u00b0F.
-
7
Lightly toast potato rolls on grill, about 30 seconds. Transfer to plate or tray and top each bun with a burger, cranberry-apple relish, gravy, spinach, and fried onions. Serve immediately.
