Sesame-Ginger and Cucumber Soba Noodles

INGREDIENTS

• 8 ounces soba noodles (about 2 bundles)
• 1 large or 2 small English cucumbers
• 1 bunch scallions (green onions), chopped (about 3/4 cup chopped)
• 1/3 cup tahini
• 2 tablespoons rice vinegar
• 1 tablespoon finely grated fresh ginger
• 1 tablespoon white miso (optional)
• 2 teaspoons reduced sodium tamari or soy sauce
• 1 teaspoon toasted sesame oil
• handful fresh cilantro, chopped
• pinch red pepper flakes
• 1/3 to 1/2 cup water
• 2 tablespoons sesame seeds (preferably black)
• sea salt, to taste