1. Cook noodles according to package directions; drain. Rinse with cold water; drain.
2. Combine parsley, miso, 2 tablespoons water, vinegar, and 1/2 teaspoon honey in a small bowl, stirring with a whisk until smooth.
3. Combine remaining 1/2 teaspoon honey, ginger, garlic, salt, pepper, and shrimp in a medium bowl; toss to coat. Heat a grill pan over high heat. Coat pan with cooking spray. Add shrimp to pan; cook 2 minutes on each side or until done. Remove shrimp from pan. Add onions to pan; cook 1 minute on each side or until well marked. Coarsely chop onions. Combine noodles, onions, oil, and juice in a medium bowl; toss to coat. Sprinkle noodle mixture with sesame seeds. Top noodle mixture with shrimp. Drizzle miso mixture over shrimp.