Combine onion and white wine in large saucepan; bring to a boil over medium-high heat. Add remaining ingredients except fish; mix well. Reduce heat to medium. Cook 10 minutes, stirring frequently. Transfer barbecue glaze to blender or food processor; process until smooth. Grill salmon over medium-hot coals, basting with barbecue glaze, about 10 minutes per inch thickness or until fish turns opaque and flakes easily when tested with fork.