If you haven't already, add the cashews to a bowl and cover with boiling water. Let sit for 30 minutes to soften.
Bring a large pot of salted water to a boil and cook pasta according to package instructions. When it's done cooking, rinse under cold water.
Finely chop the onion, celery and bell pepper. Add to a large mixing bowl.
Grate the carrot and defrost the peas as needed. Add to the bowl.
When the cashews are done soaking, drain and rinse with cold water. Add to a blender with all remaining dressing ingredients. Blend until completely smooth, about 1 full minute depending on your blender.
Taste and adjust flavors as desired.
Combine the dressing, veggies and pasta and toss well. Top with fresh black pepper and chives. Enjoy!