Preheat Bull Gas Grill to medium - high (around 450 degrees)
Coat flank steak in olive oil & salt and place on grill.
Grill the flank steak for about 4 minutes on each side. I like my steak to be an internal temp of 145 before I remove it from the grill.
Remove from grill and let flank steak rest for 10 min with aluminum foil tented over steak.
Coat bell peppers, tomatoes, & jalapeño in olive oil and grill until grill marks have formed using medium heat.
Let bell peppers, tomatoes, & jalapeño cool and place in blender and blend until desired consistency. Be very careful blending while ingredients are hot.
Add salt, cilantro, and onions, and enjoy with flank steak