I put this together for dinner tonight, and it was so good! It was very hearty and filling, with bread and cheese as an accompaniment. Amounts are just estimated guidelines. Use a good quality Dijon mustard, ideally a strong, but not too vinegary, mustard. Prep time is an estimated time for all the chopping etc listed in the ingredients. You can prepare the vegetables, steak, and vinaigrette in advance and refrigerate until ready to use--I'd say use the same day, though, or there will be some loss in quality.