Grilled Fish with Charred Garlic-Scape Relish

Ingredients

• 6 to 8 garlic scapes, trimmed
• 4 scallions, trimmed
• 2 celery ribs, finely chopped
• ½ cup green olives, such as Castelvetrano, pitted and chopped
• ½ cup fresh mint, chopped
• 2 tablespoons freshly squeezed lemon juice
• ¼ cup olive oil
• Kosher salt and freshly ground black pepper
• 2 whole fish, such as snapper or branzino (1 to 1 1/2 pounds each), cleaned
• 1 lemon, thinly sliced
• Handful of fresh mint
• 1 tablespoon olive oil