Wash the jalapenos, cut them and remove the seeds. Wash and slice the onion. Cube the beef.

In a large non stick pan, heat the olive oil and saute the sliced onions until lightly brown.

Add the cubed beef and, stirring, cook on medium high heat for about 5-6 minutes.

At this point add the sliced jalapeno peppers and saute them for 2-3 minutes. Keep stirring.

Lower the heat to medium and cook until the jalapenos are starting to wilt and the meat reaches your desired doneness.

Add the cilantro, season with salt and pepper, stir, remove from the heat and serve hot.