Remove the silver skin on the pork with a thin, sharp knife and discard. Dice the pork into roughly 1-in. Dice and place in a medium bowl (approx. 20 cubes of pork). Add harissa paste and mix well. Cover and refrigerate for 1 hour or overnight.

Heat a grill to medium-high heat. While grill is heating, prepare skewers.

Using 4 (12-in.) stainless steel skewers, skewer ingredients starting with marinated pork, then onion, mint, and black grapes, placing 5 of each of the ingredients on each skewer. Season skewers with salt and pepper and place them on the hot, clean grill grates; cook on all sides for approx. 10 minutes.

While the skewers are cooking, combine honey and water in a clean dry bowl. After the 10-minute cooking time, brush the honey mixture over the skewers on all sides and let cook for another minute or until meat is fully cooked. Make sure honey is added at the end to prevent burning.