Chilled Lettuce Soup with Caesar Crackers

Ingredients

• CHILLED SOUP

  • 1 leek, white part only, chopped
  • 1 onion, chopped
  • 1 tablespoon (15 ml) olive oil
  • 4 cups (1 litre) chicken broth
  • 1 potato, peeled and cut into cubes
  • 5 cups (1.25 litre) chopped romaine lettuce (about 1 head)
  • 1 cup (250 ml) plain yogurt (minimum 2% MF)
  • Salt and pepper

• CRACKERS

  • Zest of 1 lemon
  • 2 tablespoons (30 ml) lemon juice
  • 2 tablespoons (30 ml) olive oil
  • 1 teaspoon (5 ml) anchovy paste
  • 1 clove garlic, finely chopped
  • 2 large (25-cm/10-inch) tortillas
  • 1/4 cup (60 ml) grated Parmigiano-Reggiano
  • Salt and pepper