Combine in blender / immersion blender until paste 1 cup basil leaves 3 scallions 2 cloves garlic 2 tablespoons peperoncini, pickled jalapeno peppers (i at least double) juice of one lemon zest of one lemon 0.25 Cups olive oil spread over 2 1/2 pounds skirt steak Cover and refrigerate at least 30 minutes overnight. It will grill better if you pat it dry before grilling. Grill 3-5 minutes a side, broil 2-4 minutes a side. Failure mode for skirt steak is it gets tough. It will get tough if over done so err on the side of under done and finish up later Slice on the grain into 4 inch slabs then into strips against the grain, a See: Serious eats NYT