Heat the oil in a saucepan and when it shimmers, add the onions and saute until they start to soften and brown a little, about five minutes.
Add the garlic, red pepper, black pepper and sage and stir to mix. Saute for another minute or two until the raw garlic smell disappears.
Add the cubes of butternut squash and cook, stirring, until the squash is really soft and breaks down.
Add salt to taste, let the mixture cool a little, then place in a blender with enough water to make a smooth puree (about 1 cup).
Blend the butternut squash into a silken puree.
Transfer the puree back to the saucepan and heat through.
Add the pasta, chickpeas, lemon juice, sunflower seeds and capers and toss together. Serve sprinkled with some diced avocado and a few drops of extra virgin olive oil.