Grilled Mahi-Mahi Sandwiches

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Pickled Red Onions:

1 large red onion

1 tablespoon pickling spice 

1 cup white vinegar 

1 tablespoon kosher salt 

1 tablespoon sugar 

Garlic Aioli:

1 cup mayonnaise

1 tablespoon lemon juice 

1/2 teaspoon garlic salt 

Kosher salt and freshly ground black pepper 

Sandwiches:

2 teaspoons garlic powder

2 teaspoons paprika 

Kosher salt and freshly ground black pepper 

4 mahi-mahi fillets, thawed if frozen 

2 tablespoons olive oil 

Nonstick cooking spray, for the grill grates 

4 ciabatta rolls

1 cup baby arugula