(adapted from Everyday Food: Great Food Fast, Martha Stewart Living)
1 tablespoon canola oil
1 medium onion, finely chopped
1/2 green bell pepper, ribs and seeds removed, finely chopped
1 celery stalk, finely chopped
2 garlic cloves, minced
Coarse salt and fresh ground pepper
1 pound ground beef
1 (15-ounce) can tomato sauce
1/4 cup ketchup
1 tablespoon Worcestershire sauce
4 hamburger buns, split and toasted
In a large skillet, heat the oil over medium-high heat. Add the onion, bell pepper, celery, and garlic; season with salt and pepper. Cook, stirring frequently, until the vegetables are softened, 5 to 7 minutes.
Add the ground beef to the skillet. Cook, breaking up the meat with a wooden spoon, until it is no longer pink, 6 to 8 minutes.
Stir in the tomamto sauce, ketchup, and Worcestershire sauce into the beef mixture in the skillet. Simmer until thickened, stirring occasionally, 6 to 8 minutes.
Season the mixture with more salt and pepper, as desired. Spoon onto the buns, and serve immediately.
This is what Miriam was doing while I was making dinner: