Step 1

Combine arugula, mayonnaise, basil, lemon zest, lemon juice, garlic, 1/4 teaspoon salt, and 1/4 teaspoon pepper in medium bowl.

Step 2

Place flour in shallow dish. Pat fish dry with paper towels and season with salt and pepper. Coat fish lightly with flour. heat oil in large nonstick skillet over medium-high heat until just smoking. Cook fish until golden and thickest part of fillets flake easily, 6 to 8 minutes, flipping halfway. Serve, passing aioli at table.