Skirt steak, a toothsome and very flavorful cut of beef that is a favorite of mine, is excellent for grilling or pan-searing.
Prepare a grill or heat a broiler.
Trim the roots and ends from the spring onions, leaving about 8 inches of green stalk
In a large bowl toss the onions with the oil and salt. Grill the onions on the grill, turning them with tongs 3 or 4 times, for 5 to 7 minutes or until softened and lightly charred. If you don't have a grill, broil the onions on a broiler pan about 3 inches from the heat, turning them with tongs 2 or 3 times, for 10 to 12 minutes.
Transfer the onions to a platter and squeeze the lime halves over them.