In a medium stainless steel saucepan reduce the wine to 1/4 cup. Place the syrup in a blender and add the vinegar, mustard, and honey and blend until combined. With the motor running slowly add the olive oil and blend until emulsified. Season with salt and pepper to taste. In a large bowl, combine the garlic, olive oil, rosemary and lamb and marinate for 4 to 6 hours in the refrigerator. Prepare the grill. Thread the lamb cubes, chorizo and roasted shallots on the skewers and season with salt and pepper to taste. Grill for 2 to 3 minutes on each side for medium-rare doneness. Arrange on platter and drizzle with vinaigrette.