- 1 small onion
- a 14- to 15-ounce can whole tomatoes in purée
- 1 fresh serrano or jalapeño chile
- 3/4 pound skirt steak
- 1 tablespoon vegetable oil
- Preheat oven to 250°F.
- Halve onion and thinly slice. Drain tomatoes, reserving purée, and finely chop. Wearing protective gloves, seed chile if desired for a milder sauce and finely chop. Cut steak crosswise into 4 pieces. Pat steak dry and season with salt.
- Heat a dry 12-inch heavy skillet over moderately high heat until hot and add oil. Sauté steak about 2 minutes on each side for medium-rare and transfer to a baking dish. Keep steak warm in oven.
- To skillet add onions with tomatoes, reserved purée, chile, and salt to taste and simmer, stirring occasionally, until sauce is thickened slightly and onion is crisp-tender, about 5 minutes. Stir in any juices that have accumulated on baking dish from steak. Serve steak with sauce. Serves 2.