Gochujang Sloppy Joes

Name: Gochujang Sloppy Joes
Cuisine: American
Ingredients: 1 Tbsp. vegetable oil; 1 lb. ground beef (ideally 20% fat); 1½ tsp. Diamond Crystal or ¾ tsp. Morton kosher salt, divided, plus more; Freshly ground pepper; 1 medium green bell pepper, ribs and seeds removed, chopped; 1 medium onion, chopped; 6–8 garlic cloves, finely grated; 3 Tbsp. gochujang; 2 Tbsp. ketchup; 1 Tbsp. soy sauce; 1 Tbsp. Worcestershire sauce; 1 Tbsp. dark brown sugar; 1 tsp. yellow mustard; 1 15-oz. can tomato sauce; 1 Tbsp. balsamic vinegar; 4 potato rolls; Kosher dill spears and potato chips (for serving; optional)