From “How Not To Diet”
Aim for about 1 kg of vegetables in total
Preheat oven to 220 C. Mix vegetables with a bit of oil, onion powder and pepper. Bake for 45-60 minutes until soft and slightly caramelized. Flip halfway.
In a blender, mix 2 cups of the roast vegetables plus the peeled onion and the sauce ingredients. Blend until smooth. Adjust consistency if needed by adding more broth.
Cook pasta according to package instructions, err on the side of al dente. Drain and add in the rest of the vegetables and the sauce. Mix carefully over low flame.