Boil somyeon noodles in boiling water, then rinse with cold water.
Slice cucumber, carrot, avocado, and onion thinly.
Place the boiled noodles in a bowl and top with the prepared vegetables and salmon.
Mix soy sauce, lemon juice, olive oil, and minced garlic to make the sauce.
Pour the sauce on top and finish by sprinkling sesame seeds.