Cookwith - Classic American Hot Dogs with Mustard, Ketchup, and Grilled Onions

Ingredients

• 4 high-quality beef hot dogs
• 4 hot dog buns (preferably bakery-style or brioche)
• 1 large yellow onion, thinly sliced
• 2 tbsp classic yellow mustard
• 2 tbsp ketchup
• 1 tbsp unsalted butter
• 1 tbsp olive oil
• 1/4 tsp kosher salt
• 1/4 tsp freshly ground black pepper