Creamy Chinese Celery Soup

Ingredients

• leek (white and pale green parts only)

  chopped
  1 medium
• russet (baking) potato
  1 medium
• chopped shallot
  ½ cup
• unsalted butter
  2 tablespoons
• olive oil
  1 tablespoon
• Chinese celery (1½ lb total)

  top leaves discarded and stalks cut into 2-inch pieces
  2 bunches
• dry white wine
  ½ cup
• chicken stock or low-sodium chicken broth (32 fl oz)
  4 cups
• heavy cream
  ½ cup
• salt
  ½ teaspoon
• black pepper
  ¼ teaspoon