In an enormous skillet, heat oil over medium-high intensity. Add onion, ringer pepper, celery, and garlic; season with salt and pepper. Cook, blending habitually, until vegetables are relaxed, 5 to 7 minutes.
Add ground hamburger to skillet. Cook, separating meat with a wooden spoon, until it is at this point not pink, 6 to 8 minutes.
Mix pureed tomatoes, ketchup, and Worcestershire sauce into hamburger combination in skillet. Stew until thickened, blending at times, 6 to 8 minutes.
Season the blend with more salt and pepper, as wanted. Spoon onto buns, and serve right away.
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