Basic pantry spices transform this simple grilled fish sandwich into a punchy protein that’s perfect for a summer lunch. To grill the fish, you’ll wrap individual fillets into foil packets that you’ll toss directly onto the grates, where the fish will gently steam through until perfectly flaky.
While the fish cooks, you’ll have just enough time to whip up an easy charred scallion-lemon mayo that will pair nicely with the savory flavor of the lemon-pepper fish. To make this, all you need to do is grill a handful of scallions and a fresh lemon, which develop a sweet, charred flavor after a few minutes over direct heat. Mix these components into regular, store-bought mayo and you’ll have a delicious condiment to slather onto the fish sandwiches.