Place balsamic vinegar, jalapeño peppers, cilantro, zest and ginger in a blender and blend until smooth.
Add the olive oil and blend until emulsified.
Pour half the mixture into a bowl (reserve the other half for drizzling)
Marinade the fish in bowl for 30 minutes to 1 hour. Discard marinade.
Heat grill to high. Skewer halibut. Grill for 4-5 minutes on each side until just cooked through.
Soon reserved sauce onto platter and top with skewers. Drizzle more on top.
Season with salt and pepper.