Potatoless Potato-Leek Soup

Ingredients

• 1 medium onion ((yellow) chopped)
• 4 stalks celery (chopped)
• 3 medium leeks
• 1 medium rutabaga (peeled, and cut into 1 inch cubes)
• 1 head cauliflower (roughly chopped)
• 12 cups chicken broth
• 1 teaspoon salt (to taste)
• 3 tablespoons butter (unsalted (optional))