In a large bowl, whisk together the marinade ingredients. Reserve one cup of the marinade for the sauce and whisk in one tablespoon of kosher salt to the remaining marinade. Slice the steak across the grain into 1/4-inch-thick slices. Place the steak in the bowl and cover and refrigerate for two hours or up to one day. Remove the meat from the marinade and pat dry. Weave each slice of meat on an individual skewer (if using bamboo skewers, soak the skewers in water for 20 minutes to avoid burning). Preheat a gas grill or grill pan to medium-high heat. While the grill is preheating, bring the sauce to a simmer in a small pot over medium heat until reduced by half, approximately 5-7 minutes. Dissolve the cornstarch in one teaspoon of cold water, whisk the mixture into the sauce and cook for a minute, remove from heat. Grill the skewers for three minutes until slightly charred, flip and cook for approximately two more minutes until cooked through. Serve immediately with the dipping sauce. Serves 6 as an appetizer.