Steak with Watercress Salad and Chile-Lime Dressing

Preparation

1. Step 1

   Whisk mustard powder, fish sauce, 1/2 tsp. demerara sugar, and 1 Tbsp. very hot water in a medium bowl until sugar is dissolved; season with salt and plenty of pepper. Add steak to bowl and turn several times to coat. Let sit while you make the vinaigrette.

   Step 2

   Whisk chile, lime juice, 2 Tbsp. olive oil, and remaining 1/2 tsp. demerara sugar in a large bowl; set vinaigrette aside.

   Step 3

   Heat vegetable oil in a medium skillet, preferably cast iron, over medium-high. Add steak and cook, turning every couple of minutes, until nicely browned and medium-rare, 7–10 minutes. Add butter to skillet, then tilt skillet toward you and use a large spoon to baste steak with foaming butter for a minute longer. Transfer steak to a cutting board and let rest 5 minutes.

   Step 4

   Meanwhile, add watercress, cucumbers, and mint leaves to bowl with reserved vinaigrette and toss to combine; season salad with salt and pepper. Top with peanuts and drizzle with olive oil.

   Step 5

   Slice steak and serve with salad.