Bring a large pot of water to a boil. Cook the pasta according to package directions.
In a small bowl, mix the tahini, oil, garlic, and miso until smooth and well combined. When the pasta is almost done cooking, add the avocado to the miso mixture, smashing the avocado until smooth.
Drain pasta, reserving 1 cup of pasta cooking water.
Add the pasta cooking water 2 tablespoons at a time to the avocado-miso mixture. Stir well after each addition of water, the sauce will be thick at first. Continue to add pasta water until the desired consistency is reached.
Add the pasta, veggies, and sauce to a large serving bowl. Toss lightly to combine. Serve immediately, and enjoy!
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