Score the flank steak on both sides lightly.
Place in plastic zipper bag
mix lime zest and juice, green onions, garlic, cilantro, olive oil, coriander, cumin, chile powder, hot pepper sauce, salt, and pepper.
put into bag and mix well coaring flank steak.
Marinate in refrigeration overnight for 12 hours minimum.
preheat grill. to medium high.
put steat on grill.
grill for 4-5 min a side for med. rare,
5-7 min per side for medium.
8-10 min a side for well done.