Preheat a grill pan over high heat for 2 minutes. Once hot, add the beef slices and grill for 1 minute on each side. Remove the beef from the pan and set aside.
In a large bowl, combine the hoisin sauce, ketchup, barbecue sauce, nam pla, soy sauce, grated ginger, vegetable oil, chopped scallions, and cilantro. Whisk until well mixed.
Add the grilled beef to the bowl and toss to coat. Cover and refrigerate for at least 1 hour to allow the flavors to meld.
After marinating, take the beef out of the refrigerator. Thread each piece of beef onto a 6-inch bamboo skewer.
Arrange the skewers on a decorative platter and garnish with additional chopped cilantro.
