In a small bowl, whisk together mustard, ketchup, brown sugar, Worcestershire sauce, salt, and pepper. Set aside.
Heat vegetable oil in a large skillet over medium heat. Add onions and peppers, and cook until they start to soften, about 5 minutes.
Push the onions and peppers to one side of the skillet, and add the sausages. Cook the sausages until browned on all sides, about 8-10 minutes.
Once the sausages are cooked, pour the mustard sauce over them in the skillet. Stir everything together, ensuring the sausages are coated in the sauce.
Cover the skillet and let the sausages simmer for another 5 minutes, allowing the flavors to meld together.
While the sausages are simmering, lightly toast the hot dog buns on the grill.
To serve, place a sausage with some onions and peppers onto each hot dog bun.
Garnish with additional mustard and ketchup if desired.
Serve immediately and enjoy your delicious picnic sausage!
Interesting Facts
Sausages are a popular food for picnics because they are easy to prepare and can be served hot or cold.
The combination of mustard and brown sugar in the sauce adds a perfect balance of tanginess and sweetness to the dish.
Feel free to experiment with different types of sausages to customize the flavor of this recipe.