Silky Cauliflower Soup

Ingredients

• 1 head cauliflower
• 2 tablespoons extra-virgin olive oil
• 1 small onion, chopped
• 2 cloves garlic, minced
• 1 quart low-sodium chicken stock
• 1/2 cup finely grated parmesan
• salt and freshly ground black pepper
• 2 tablespoons mayonnaise – or – 1 egg
• 1 tablespoon fresh lemon juice
• 1/2 teaspoon dijon mustard
• 1 small garlic clove, minced
• 1/2 teaspoon worcestershire sauce
• 1 oil-packed anchovy fillet, finely chopped (optional)
• 1/4 cup extra-virgin olive oil