Grilled Italian Sausage with Sweet and Sour Peppers and Onions Recipe

• 1 tablespoon vegetable oil
• 1 large onion, sliced into 1/4-inch strips (about 2 cups)
• 2 red bell peppers, stem and core removed, sliced into 1/4-inch strips
• 2 green bell peppers, stem and core removed, sliced into 1/4-inch strips
• 3 tablespoons apple cider vinegar
• 3 tablespoons sugar
• Kosher salt and freshly ground black pepper
• 3 pounds sweet or hot Italian sausage
• Buns for serving

Directions