Ingredients
2 carrots, peeled into ribbons (about 2 cups)
1 small cucumber, such as Persian, thinly sliced (about 1 cup)
4 radishes, very thinly sliced (about 1 cup)
1/4 cup unseasoned rice-wine vinegar
2 teaspoons sugar
Coarse salt and freshly ground pepper
1/3 cup mayonnaise
1 1/2 teaspoons Sriracha, plus more for serving (optional)
2 skinless red-snapper fillets (each about 8 ounces)
Extra-virgin olive oil, for brushing
4 Portuguese rolls, halved
1/2 cup lightly packed fresh cilantro leaves
Preparation
Toss carrots, cucumber, radishes, vinegar, sugar, and 1/2 teaspoon salt in a bowl. Mix mayonnaise and Sriracha in another bowl.
Preheat grill to medium-high. Brush fish with oil; season with salt and pepper. Brush grates with oil. Grill fish until bottom edges turn opaque, about 3 minutes. Flip with 2 large spatulas and cook until opaque in center, about 3 minutes. Remove from grill; cut each fillet in half crosswise. Meanwhile, grill rolls until lightly marked.
Spread mayonnaise mixture on all roll halves. Layer fish and pickled vegetables on bottom halves; drizzle with pickling liquid and top with cilantro. Serve immediately, with more Sriracha.