Fresh cilantro leaves and sunflower sprouts or pea shoots (optional toppers)
Grill asparagus, onions and pepper over medium heat for 5 minutes or until lightly charred, turning once or twice. Thinly slice pepper and cut asparagus and onion into bite-size pieces.
Melt butter in a large skillet; add lime juice, vegetables and salt and cook for 1 minute.
Grill tortillas until lightly charred or cook on a lightly oiled baking sheet at 400°F for 5 minutes. Spread equal amounts of cheese on hot tortillas and top with vegetables. Sprinkle with cilantro and sunflower sprouts or pea shoots, if you like.