2 cups baby greens (such as spinach, arugula or watercress)
Directions
To a medium bowl, add the filet mignon and 1 teaspoon of the salt. Toss to combine, then cover the bowl with plastic wrap and refrigerate for 1 hour.
In a small bowl, whisk together the soy sauce, oyster sauce and sugar until the sugar has dissolved. In another small bowl, whisk together the remaining ½ teaspoon of salt, the black pepper and lime juice.
To a large skillet set over high heat, add the grapeseed oil. Right before the oil begins to smoke, after about 2 minutes, add the filet mignon and sear, without stirring, for 1 minute. Use a metal spatula to turn the beef over and cook on the other side for 1 minute. Add the butter, soy sauce mixture, red onion and scallions. Cook, stirring often, until the meat, red onion and scallions are well coated with the sauce, about 1 minute.
Arrange the greens on a platter and spoon the filet mignon over the greens. Serve immediately, with the lime juice mixture on the side for dipping.