Rip 150 g lettuce leaves into rough pieces and place them in a bowl of cold water while you mix the sauce.
Add all of the sauce ingredients to a bowl (1 tbsp toasted sesame oil, ½ tbsp toasted white sesame seeds, 1 tsp Japanese soy sauce (koikuchi shoyu), ½ tsp sugar, ½ tsp dashi granules, ½ tsp Chinese-style chicken bouillon powder, ½ tsp garlic paste, ½ tsp yellow miso paste (awase), ½ tsp rice vinegar, ⅛ tsp salt, and ground black pepper) and mix.
Drain the lettuce and dry thoroughly, either using a salad spinner or kitchen paper. It's important the lettuce leaves aren't wet as any remaining water will dilute the sauce. Then add them to the bowl of sauce and mix by hand until evenly coated.
Transfer to a serving bowl and garnish with 1 sheet roasted seaweed for sushi (nori) ripped into rough pieces.
Enjoy!
Notes
Soak lettuce in cold water to ensure maximum crunchiness and crisp texture.
Tear lettuce by hand rather than cutting with a knife to prevent discoloration and maintain fiber structure. Hand-torn edges also hold dressing better than knife-cut edges.
Mix dressing with hands to make sure even coating on all lettuce leaves. Use gentle massaging motions when mixing to help flavors combine thoroughly.