Layer every two slices of thickly cut tomatos with one slice of thinly cut red onion on a serving dish.
In a medium bowl, whisk together the Dijon mustard, red wine vinegar and steak sauce, then slowly whisk in the EVOO. Drizzle the dressing over the tomato red onion slices and serve.
This is one of many “Yum-o!” recipes – it’s good and good for you. To find out more about Yum-o!, Rachael’s nonprofit organization, go to www.yum-o.org.