Ingredients

  • 1 1/2 sticks unsalted butter
  • 6 small leeks (about 1 3/4 pounds), white and light green parts only, thinly sliced (4 cups)
  • 4 pounds large Yukon Gold potatoes, peeled and thinly sliced
  • 1 bunch broccoliflorets coarsely chopped, stems peeled and sliced
  • 4 cups chicken stock or low-sodium broth
  • 2 cups half-and-half or heavy cream
  • Salt and freshly ground white pepper
  • One 12-ounce loaf of sourdough bread, crusts removed and bread cut into 1-inch cubes
  • 1/4 cup canola oil
  • 2 ounces thinly sliced pancetta, finely chopped (1/4 cup)
  • 2 tablespoons chopped sage
  • 1 tablespoon chopped rosemary

Method

  • In a very large pot, melt 1 stick of the butter.
  • Add the leeks, potatoes and broccoli and cook over high heat for 10 minutes, stirring frequently.
  • Add the stock and 6 cups of water, cover and bring to a boil.
  • Simmer over moderate heat until all of the vegetables are tender, about 10 minutes.
  • Working in batches, puree the soup until very smooth.
  • Return the puree to the pot and stir in the half-and-half.
  • Season the soup with salt and white pepper.
  • Keep warm.
  • Meanwhile, pulse the bread cubes in a food processor until coarse crumbs form.
  • In a large skillet, melt the remaining 4 tablespoons of butter in the oil.
  • Add the pancetta, sage, rosemary and bread crumbs and cook over moderately high heat, stirring frequently, until the crumbs and pancetta are browned and crisp, about 10 minutes.
  • Drain on paper towels.
  • Ladle the soup into bowls, garnish with the pancetta crumbs and serve.