Bring a large pot of salted water to the boil and add the pasta, stirring. Cook according to the packet instructions until al dente, adding the beans for the last 60 seconds and cooking until the veggies are crisp and bright green. Reserving 1/2 cup of the pasta cooking water, drain the pasta and veggies.
For the creamy tahini sauce, add the tahini, lemon juice, garlic and the reserved pasta water to a blender or small food processor. Blend until smooth and creamy. If the sauce is too thick, add more water to thin it down. Add the nutritional yeast, olive oil and stir to combine. Season well with sea salt and black pepper.