Chilled Lettuce Soup with Caesar Crackers | RICARDO

Ingredients

• 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
• 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