To prepare the dressing, whisk all ingredients together and set aside.
To make the salad, season the filet with salt and pepper and stear in a hot skillet for 2-3 minutes per side, or until medium rare. Let the meat rest for a few minutes, then slice on the bias and toss with 2-3 tablespoons of the dressing.
Mix the remaining salad ingredients (except the peanuts) in a large bowl and drizzle with dressing until well coated.
Divide the salad between two plates, mound the beef on top and sprinkle with the chopped peanuts.
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