In a large skillet, heat 1 tablespoon of canola oil over medium-low heat. Add the finely chopped onion and green bell pepper, stirring frequently for about 5 minutes until tender.

Push the sautéed vegetables to the edges of the skillet, increase the heat to medium-high, and add 1 pound of ground beef to the center. Let it cook undisturbed for about 5 minutes until it starts to brown.

Once browned, season with salt and black pepper to taste, break apart the meat, and continue cooking for an additional 2-3 minutes until no longer pink.

Reduce heat to medium-low and add in ketchup, yellow mustard, Worcestershire sauce, and sugar. Stir well and simmer for about 2-3 minutes.

Spoon generous portions of the savory mixture onto toasted buns and serve warm.