Cauliflower With Quinoa, Prunes, and Peanuts

3 tablespoons olive oil 1/4 red onion, minced 1 shallot, minced 1 garlic clove, minced 1/2 cup quinoa 2 cups vegetable broth or water 1 sprig thyme Salt and pepper 1 head cauliflower 1/3 cup finely diced prunes 2 tablespoons chopped unsalted roasted peanuts, plus 1 tablespoon crushed nuts 1 tablespoon onion puree (2 tablespoons olive oil, 1 onion, very thinly sliced, 1 tablespoon sherry vinegar, Salt & pepper) 1 tablespoon unsalted butter 2 tablespoons finely chopped cilantro, plus a handful of whole leaves 1 tablespoon finely chopped chives