Place each steak in the center of a piece of foil. Season both sides with salt and pepper.
Add bell pepper, onion, jalapeño and cilantro on top of the steaks. Squirt lime juice over each and leave 1/2 a lime in each packet.
Place a second piece of foil on top of the steak and fold the edges.
Place steak in the refrigerator to marinate while you heat the grill or oven. For oven baked, heat oven to 450 and place foil packs in oven for 15 minutes. For grilling, heat grill to medium and grill for 8-10 minutes, flipping halfway through.
Open carefully to peak and see if steaks are finished. Removed from foil to plates and serve.