This is weeknight comfort food at its finest. We created a homemade sauce that is tangy and flavorful but also quick and easy. We used both ketchup and canned tomato sauce for lots of tomato-y zip and just a touch of brown sugar for a bit of sweetness and slight caramel finish. Green bell pepper is a key addition; it really enhances the other ingredients, elevating the flavor profile into the realm of a true sloppy joe.
Achieving a deep caramelization on the onions and bell peppers is crucial for building foundational flavor; don't rush this step. Ensure the ground beef is thoroughly browned and all moisture has evaporated before adding the sauce ingredients – this prevents a watery sauce and concentrates meaty flavor. Taste and adjust seasoning diligently before serving, balancing the sweetness from brown sugar with the tang from vinegar and mustard. For an extra layer of texture, consider buttering and griddling the hamburger buns until golden brown, not just toasting. A pinch of smoked paprika or a dash of your favorite hot sauce can add complexity.