Combine 1 Tablespoon oil, 2 teaspoons chipotle, 1 1/2 teaspoons salt, and cumin in a small bowl.
Cut flank or skirt lengthwise into strips approximately 2-3" wide. Rub the chipotle marinade on all sides of the meat.
At this point, steak can be frozen or refrigerated until ready to grill.
While steak is marinating, prepare charcoal or gas grill.
When grill is ready, place steak pieces on the hottest section of the grill and the jalapenos and green onions on the cooler sections. Grill steak until medium rare, about 125-130 degrees F., turning every 2-3 minutes to ensure even cooking on all sides. Grill the onions and jalapenos until charred and blistered. Meat should take about 7-10 minutes.
Once meat is cooked, cover it while making the Jalapeno-Green Onion Salsa.
Slice meat against the grain and serve with warm corn tortillas, lime wedges, Jalapeno-Green Onion Salsa, cilantro leaves and Mexican crema or sour cream.