For more protein, add chicken, tofu, or edamame. The amount of Chili Crisp determines the heat — reduce it for a milder version. Tahini and sesame give the dressing depth and a nutty aroma; bok choy adds bite and freshness.
Tahini, soy milk, and Chili Crisp together form a dense, creamy sauce that quickly turns grainy and broken without sufficient power. The Vitamix emulsifies these ingredients in 42 seconds into a uniformly smooth dressing that clings to the noodles — a spoon or shaker would produce a far less homogeneous result.
Start the dressing on the lowest speed, then ramp quickly to maximum — this builds the tahini-and-soy-milk emulsion evenly from the start, preventing individual ingredients from sticking to the bottom of the container.