Remove about ⅓ of the rosemary from the end of the sprigs. Finely chop the rosemary for the sauce.
To a mixing bowl, add the hot sauce, apple juice, melted butter, chopped rosemary and salt and pepper to taste, mix well.
Add the chicken to a sealable bag or dish with a lid. Pour ⅔ of the hot sauce mixture over the chicken and mix well. Seal and refrigerate for 1 hour up to 24 hours. Set the other ⅓ of the sauce aside.
Once the chicken has marinated, pat the pieces dry with a paper towel.
Take a sprig of the rosemary and skewer the 2 pieces of chicken, repeat with the rest of the chicken.
Preheat a grill pan over medium high heat.
Brush the chicken with olive oil and grill.
Turn the chicken after 2 minutes and brush the grilled side with reserved hot sauce (do not use the marinade).
When the chicken is cooked on the second side transfer to a plate and brush with more hot sauce.
This recipe yields 16 skewers with 2 pieces of chicken on each skewer.