Roasted Cauliflower with walnuts

2 whole garlic bulb dry layers of skins removed, top quarter of heads cut off and discarded * 5 1/2 tablespoons vegetable oil such as olive oil, canola oil,[...]

1 each - cauliflower, cut into bite-size florets * 5 tablespoons olive oil 1 1/4 teaspoons salt or to taste 1/2 teaspoon black pepper freshly ground, or to[...]