Kleutsch said the latter was inspired by the mustard sauce used at Leroy and Lewis, which, it turns out, was inspired by an older barbecue spot outside of Austin called The Salt Lick.

Source: https://www.chicagotribune.com/dining/ct-food-lucys-bbq-highland-indiana-tt-0315-20230315-nl2ysp4yivfsjc4wcbgb5cxbsi-story.html

Steak becomes a casual weeknight dinner in this relaxed “sauté-fry” in which slices of meat are mixed with lightly charred asparagus and drizzled with a mustard sauce spiked with Chinese black vinegar and sesame oil.

Source: https://www.latimes.com/recipe/steak-asparagus-saute-fry-dijon-sesame-dressing