Cook the soba noodles according to package instructions. Once done, drain them and rinse under cold water to stop the cooking process and cool them down.
In a medium bowl, whisk together the peanut butter, sesame oil, soy sauce, rice vinegar, honey (or maple syrup), and grated ginger until smooth and creamy. If the sauce is too thick, add a tablespoon of water to thin it out.
In a large mixing bowl, combine the cooled noodles, julienned cucumber, sliced red bell pepper, and chopped green onions.
Pour the peanut sauce over the noodle mixture and gently toss everything together, ensuring that the sauce evenly coats all the ingredients.
Add salt and pepper to taste, then fold in the chopped cilantro and sprinkle with toasted sesame seeds.
Chill in the refrigerator for at least 30 minutes before serving to let flavors meld.
Notes
Serve in decorative bowls, garnished with cilantro and sesame seeds.