Prep Time 20 minutes mins
Cook Time 12 minutes mins
Resting Time 5 minutes mins
Total Time 37 minutes mins
For juicier steak, choose flank or skirt and avoid overcooking; a quick sear and proper 5-minute rest keeps it tender. If grilling outdoors, preheat to high and oil the grates to prevent sticking. You can swap basil with more spinach or arugula for a peppery twist and use walnuts or almonds if pine nuts aren’t available. Make the pesto up to 3 days ahead and refrigerate with a thin oil layer on top to prevent browning, or freeze in portions. Warm tortillas are less likely to tear, and a light pesto base helps the fillings adhere. Add pickled onions or a squeeze of lemon for brightness, and adjust heat with extra red pepper flakes.