Cook noodles in a large pot of boiling, well-salted water until tender, according to package instructions.
Drain and rinse thoroughly with very cold water until all noodles are cool. Drain well. Toss with 2 TB sesame oil and set aside.
In a large bowl, whisk together the remaining sesame oil, Tahini, soy sauce, sugar, rice vinegar, ginger powder, and white pepper.
Add 1/4 cup hot water to thin out the sauce; whisk until combined.
Add cooked/cooled pasta, cucumbers, and carrots to the sauce. Toss well to combine. If using chicken or shrimp, add those and toss to combine. Garnish as desired. Serve immediately.
Notes
Toss the noodles with a little sesame oil right after rinsing. This keeps them from sticking and adds an extra layer of flavor even before you mix in the sauce.
Use good-quality Asian toasted sesame oil and pure tahini for the best flavor. Tahini gives the sauce richness and body, while toasted sesame oil adds a nutty depth that mimics the taste of peanut-based sauces - without the peanuts.
Slice the cucumber and carrot thinly so they add crisp texture without overpowering the noodles. A julienne peeler or mandoline can make quick work of this.
Toss everything together just before serving. The noodles absorb the sauce over time, so mixing right before helps keep things flavorful and saucy.
Leftovers are still delicious but will dry out a bit. Add a drizzle of sesame oil or warm water and toss again before eating cold or at room temperature.
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