Foil-Packet Fish With Corn Relish

INGREDIENTS

• 2 tablespoons vegetable oil
• 1 cup fresh cilantro, plus more for garnish
• 1 1-inch piece ginger, peeled and roughly chopped
• 1 cup fresh parsley
• 2 medium tomatoes, cut into chunks
• 1 3/4 cups corn kernels (fresh or frozen; thawed if frozen)
• 4 6-ounce skinless striped-bass fillets (about 1 inch thick)
• 1 teaspoon coriander seeds
• 2 limes, cut into wedges
• Kosher salt