• Root Vegetables and quantities: To get 10-12 cups of diced vegetables, I used 1 large sweet potato (~3 cups), 2 medium-large carrots (~2 cups), 1 large celery root (~2 cups), 1 large white turnip (~2 cups) plus 2 cups cubes of butternut squash (not actually a root vegetable but great in this soup). Feel free to use any combination of these or other root veggies you like including parsnips, rutabaga and white potato.
• Broth or Water options: Use any combination of water and vegetable broth. You can even use chicken broth. I use part vegetable broth and part concentrated undiluted canned chicken broth (adding my own water) if I’m not serving to vegetarians. I find it has more depth. Needless to say, homemade vegetable or chicken broth is even better.
• Barley – soak or not? Pearl barley, the kind of barley sold in most grocery stores, has its outer husk removed, so technically there is no need to soak it. To make it cook faster, I do give it a quick rinse and soak while I’m cutting up the vegetables. Feel free to ignore.
• Homemade Croutons (for 2-4): Cut 2 slices bread into 1/2-1 inch pieces. Most breads will work. Stale is good but not essential. Heat a tablespoon of oil in a pan to medium. Add bread cubes in a single layer in pan. Sprinkle with salt (and garlic powder if desired). Continue to toast, stirring occasionally until nicely browned, about 4-5 minutes.
• Make Ahead: Root vegetable soup can be stored in the fridge in a sealed container for 4 days. Or frozen for up to 4 months. It gets thicker on standing or freezing, so add some additional broth or water when reheating.