Blend first 5 ingredients in medium bowl. Combine kumquats and sugar in small bowl. Let stand 30 minutes, stirring kumquat mixture occasionally. Heat oil in heavy large nonstick skillet over high heat. Add ginger and stir 1 minute. Add pork mixture and stir-fry until pork is just cooked through, separating pork strips, about 3 minutes. Add kumquat mixture, broth and vinegar and stir until sauce boils and thickens, about 1 minute. Season with salt and pepper.