Step 1

1 Bring a large pot of water to a boil over high heat and salt it, if desired

Step 2

2 Meanwhile, in a blender, preferably a high-speed one, combine the spinach, cilantro, tahini, lime juice, water, scallions, garlic, soy sauce, and maple syrup or honey

Step 3

3 Blend until combined and flecks of green splatter the interior

Step 4

4 Stop the blender to scrape down the pitcher

Step 5

5 If the sauce is too thick, add more water, 1 tablespoon at a time, and continue blending until a smooth, green sauce forms

Step 6

6 Taste, and add more lime juice, if desired

Step 7

7 Add the soba to the boiling water and give the noodles a quick stir

Step 8

8 Boil until just tender, about 3 minutes

Step 9

9 Drain, transfer to a large bowl and immediately toss with the sesame oil until well coated

Step 10

10 Just before serving, divide the noodles among plates or shallow bowls and drizzle with the sauce

Step 11

11 Serve warm, with sesame seeds sprinkled over the top, if desired