Add cooking spray to a nonstick sauté pan over medium-high heat.
Add onion, red bell pepper and garlic. Sauté for 5 minutes, stirring frequently.
Add turkey and sauté 5-7 minutes, stirring frequently until turkey is just cooked through.
Add tomato paste, Dijon mustard, hot sauce, tomatoes, honey and ground black pepper.
Bring to a simmer for 5 minutes, stirring frequently.
Toast the hamburger buns. Fill each bun with 1/2 cup turkey mixture to make 8 sandwiches.
Optional: top each sandwich with lettuce, red onion, or pickles for crunch.