Vermicular | Saba Sando (Grilled Mackerel Sandwich)

Ingredients

• 6 oz mackerel fillet, deboned, cut into 2 fillets
• Kosher salt
• All-purpose flour
• 1 teaspoon olive oil
• 2 slices country bread, sliced into ¾” thickness
• 2 teaspoons mustard
• 2 tablespoons mayonnaise
• 1 leaf kale, torn into bite-sized pieces
• 3 slices red onion, sliced into ¾“ thickness, soaked in water, drained
• Sliced pickles
• 2 teaspoons olive oil, divided