5 pounds cauliflower, cut into 1-inch florets (about 18 cups). 2 large leeks, white and pale green parts only, halved lengthwise, rinsed and cut into ½-inch pieces
1/2 pound sliced bacon, cut into 1/2-inch pieces. 1 medium onion, finely chopped (about 1 1/2 cups). 6 scallions, white and pale green parts only, thinly sliced
