In a blender or food processor, whirl until smooth remainder of the nectarines with vinegar, tomato paste, sugar, Worcestershire sauce, garlic and hot sauce.
3
Stir in orange peel.
4
Remove about 1/3 cup sauce to baste over flank steak or other beef steak for last few minutes barbecuing.
5
Add remaining nectarine slices to remaining sauce and serve with beef.