Preheat the grill to 375 degrees F and prepare for indirect cooking.
2
Wash the bell peppers, cut the tops off, and remove seeds and membranes. Set aside.
3
Heat a large cast-iron pan over medium heat on the stovetop or grill. Add olive oil and diced red onion, and cook for 5 minutes to soften the onion.
4
Add the ground beef to the pan and cook, breaking it up with a spatula, until cooked through, about 6-8 minutes.
5
Stir in minced garlic and cook for an additional 1 minute.
6
Add pre-cooked jasmine rice, salsa, kosher salt, coarse black pepper, and Worcestershire sauce to the pan, and mix well.
7
Remove the beef and rice mixture from the heat and add half of the shredded cheddar cheese. Stir to combine, taste, and season as needed.
8
Stuff each bell pepper with the beef and rice mixture, dividing it evenly among peppers. Top each pepper with the remaining cheddar cheese.
9
Place peppers upright on the grill grate over indirect heat, and cook for 30-40 minutes or until the peppers are tender and the cheese has melted. You can place them snugly in a grilling pan if they need support to stand upright.