Try this homemade Marinated Flank Steak With Mustard Sauce recipe the whole family will love. Made with buttermilk, garlic, soy sauce and extra virgin o…
This Marinated Flank Steak With Mustard Sauce relies on simple, everyday ingredients such as buttermilk, garlic cloves, smashed, low sodium soy sauce and extra virgin olive oil. It comes together quickly and makes 4 servings, at about 1324 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.
Updated Jun 30, 2026