How to Make It
Heat the broiler. Rub the flank steak with the 1 teaspoon oil, 1/2 teaspoon of the chili powder, and 1/4 teaspoon of the salt. Broil the meat until medium rare, about 4 minutes per side. Let it rest for 5 minutes and then cut it diagonally into slices.
In a large glass or stainless-steel bowl, combine the pineapple, the remaining 1/4 cup oil, the jalapeño pepper, onion, lime juice, cilantro, black pepper, and the remaining 1/2 teaspoon salt and 1/4 teaspoon chili powder. Stir in the sliced steak.
In a large pot of boiling, salted water, cook the penne until just done, about 13 minutes. Drain and toss with the salsa and steak.