Boil the buckwheat noodles in boiling water for 4 minutes, then rinse them in cold water.
Julienne cucumber, carrot, and bell pepper.
Mix the vegetables with the cooked noodles.
Combine soy sauce, vinegar, olive oil, and lemon juice to make the dressing.
Pour the dressing over the noodles and vegetables and toss evenly.
Sprinkle sesame seeds and seaweed flakes to finish.