Step 1

Cool the lo mein noodles according to package directions for al dente. Drain and toss with two tablespoons of sesame oil in a large bowl. Cover and chill for one hour.

Step 2

Meanwhile, prepare the vegetables. Slice the scallions and cut the bell pepper, carrot, and cucumber into thin matchsticks. Set a few pieces of each vegetable aside to use as garnish (optional).

Step 3

Whisk together the sauce ingredients in a medium bowl. Add the chilled lo mein noodles and vegetables and toss well. Garnish with reserved vegetable pieces and sprinkle with sesame seeds. Serve at once.