Roasted Cauliflower without ricotta croutons

3 leeks , white part only, washed and thickly sliced 1/2 head garlic , cut so cloves are exposed 1 large head cauliflower , cut into florets 1 -2 tablespoon[...]

1 large head cauliflower , cut into florets (about 3 pounds) 1 large onion , sliced 2 garlic cloves , each halved 2 tablespoons olive oil 2 (14 1/2 ounce)[...]

1 large head cauliflower , cut into florets (about 3 pounds) 1 large onion , sliced 2 garlic cloves , each halved 2 tablespoons olive oil 2 (14 1/2 ounce)[...]

3 leeks , white part only, washed and thickly sliced 1/2 head garlic , cut so cloves are exposed 1 large head cauliflower , cut into florets 1 -2 tablespoon[...]