Step 2: Brown the Beef
Heat a large skillet or Dutch oven over medium-high heat and add a small drizzle of olive oil or a teaspoon of butter. Add the ground beef and season immediately with salt and freshly ground black pepper. Cook the beef, breaking it apart continuously with a wooden spoon or spatula, until it is fully browned and no pink remains — this takes approximately 5 minutes over medium-high heat. The goal is actual browning rather than just cooking through: meat that makes contact with a properly hot pan and is allowed to sit undisturbed for 30 to 60 seconds before being broken apart will develop browned, caramelized bits that add significant flavor to the finished dish. Once the beef is browned, tilt the pan and use a spoon to remove the excess fat, or carefully blot it with paper towels. Leave just a small amount of fat in the pan for richness.
Step 3: Cook the Vegetables
Add the diced onion and bell pepper to the pan with the browned beef. Cook over medium heat, stirring occasionally, for about 4 to 5 minutes until the vegetables are softened and the onion is translucent. Add the minced garlic and cook for an additional 30 seconds to one minute, stirring constantly, until the garlic is fragrant. Be careful not to allow the garlic to brown — it can go from fragrant to bitter very quickly at this stage. The vegetables and beef should be well combined at this point, with the onion and pepper softened enough that they will melt into the sauce during simmering.
Step 4: Add the Sauce and Simmer
Pour the prepared sauce over the beef and vegetable mixture and stir thoroughly to combine, making sure every piece of meat is coated with the sauce. Bring the mixture to a light boil, then reduce the heat to medium-low and simmer uncovered for 10 to 15 minutes, stirring occasionally. The simmering period is what transforms a simple mixture of beef and sauce into a cohesive, deeply flavored filling — the sugars in the tomato sauce and ketchup caramelize slightly, the Worcestershire sauce mellows and integrates, and the overall flavor develops from sharp and separate ingredients into something unified and complex. The sauce should thicken noticeably during this time. If you prefer a looser, sloppier filling, add a splash of water and simmer for a shorter time. If you prefer a thicker filling where the sauce clings closely to the meat, simmer uncovered for the full 15 minutes or even a few minutes longer, stirring frequently.
