How to Make It
Heat a large grill pan for 10 minutes. Brush the steaks with oil; season with salt and pepper. Grill over high heat until lightly charred, 45 seconds. Flip and grill until medium rare, 30 seconds. Transfer to plates.
In a large bowl, whisk the 2 tablespoons of oil with the lemon juice, shallot and mustard; season with salt and pepper. Add the watercress, hearts of palm and avocado, season with salt and pepper and toss. Mound the salad beside the steaks, top with the chives and serve with lemon wedges.