Guests can fill lettuce cups with steak and fresh herb sprigs or place steak and herbs in lettuce leaves and roll them. If you can't find Memmi Noodle Soup Base, use a combination of fish stock, soy sauce, sugar, and vinegar.
Toss steak with whiskey. Cover tightly, and refrigerate 8 hours. Transfer steak to a large bowl. Whisk together soup base and sugar until sugar dissolves, and pour over steak. Add garlic, scallions, sesame seeds, and sesame oil, and toss to combine thoroughly. Cover tightly, and refrigerate at least 4 hours and up to 8 hours.
Let steak sit at room temperature 1 hour, and season with salt. Meanwhile, heat grill to medium-high. Grill steak 1 to 2 minutes per side for medium-rare. Serve with radicchio and lettuce leaves and herbs.