Brown ground turkey in a large skillet over medium-high heat.
Add pepper and onion and cook for 5 minutes, stirring frequently.
In a small bowl, whisk together brown sugar, vinegar, steak seasoning, Worcestershire sauce and tomato sauce.
Add sauce to skillet, reduce heat to medium and let simmer, stirring occasionally, for 8-10 minutes.
Serve warm on hamburger buns.
Notes
For an even more delicious sloppy joe, toast your hamburger buns before serving. Spread some butter on the inside of each bun and place buttered side down on a hot skillet until golden brown.