Instructions: Cook the onions in the butter in a 4-quart saucepan over medium heat until tender, about 5 minutes. Remove from the pan; set aside.

Spray the saucepan with nonstick cooking spray. Add the turkey and cook, stirring occasionally, until the turkey is no longer red, about 5 minutes.

Stir in the celery, bell pepper, brown sugar, salt, Worcestershire sauce, chili sauce and vinegar. Bring to a simmer, cover and cook 30 minutes, stirring occasionally. Spoon the filling onto the buns.

This recipe yields 12 servings.

Make ahead tip: The filling can be made a day ahead and reheated. Just grill the buns at the last minute; spray them with nonstick cooking spray or lightly brush them with oil before placing them on the grill.

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