While the cauliflower bakes, make the sauce. Heat the oil in a medium saucepan over medium heat. When the oil is hot, add the garlic, ginger, and dried chile peppers. Sauté until very fragrant and the chile peppers darken, about 1 minute. Add the water, soy sauce, sherry, vinegar, maple syrup, sesame oil, black pepper, and star anise. Raise heat and bring to a simmer. Lower heat and allow to simmer, uncovered, for about 10 minutes, until the sauce has reduced by about a third, stirring occasionally. Stir in the bell pepper and allow to simmer about 5 minutes more, until the pepper is tender.