Directions
In a small bowl, whisk the soy sauce, sugar, vinegar, oil, garlic, ginger, and chili paste. Add the scallions and cilantro. Place steak in a non-reactive dish and pour in the marinade, turning the steak to coat both sides. Cover and refrigerate for at least 3-4 hours, turning once or twice.
Toast the sesame seeds in a clean, dry nonstick skillet over low heat. Shake and stir until the seeds are golden brown, but before they begin to pop, 2-3 minutes. Turn out onto a plate and allow to cool for 10 minutes. Add the sea salt and combine in a mortar and pestle. Lightly crush the seeds so that some texture remains.
Prepare the grill for direct cooking over medium heat
Remove the steak from the refrigerator and allow to come to room temperature 20-30 minutes before grilling. Grill 8-10 minutes for medium rare, turning once. Transfer to a cutting board to rest while grilling asparagus.
Arrange asparagus on a grill-safe pan, season with olive oil, salt, garlic powder, and/or lemon pepper and grill over direct heat until crisp-tender, about 4-6 minutes, rolling a couple of times. Remove from heat and place on platter for service.
Thinly slice the steak on the bias and arrange on a platter, sprinkle with gomashio and cilantro (or parsley).