Star Anise-Rubbed Grilled Shrimp

Rubbed shrimp:

• 9 star anise
• 1 teaspoon coriander
• 1 tablespoon dried parsley flakes
• 2 teaspoons dried chives
• 1 teaspoon tobarashi (Japanese 7-spice)
• 2 teaspoons garlic powder
• 1 teaspoon salt
• 2 pounds (16 to 20 size) shrimp, deveined

Ponzu sauce:

• 6 tablespoons low-sodium soy sauce
• 6 tablespoons rice vinegar
• 2 tablespoons brown sugar
• 2 tablespoons lemon juice
• 2 tablespoons lime juice
• 2 teaspoons ginger juice from a jar of pickled ginger
• 2 teaspoons chopped fresh chives
• 1 tablespoon minced parsley leaves