Saute Onion until soft (about 3-5 minutes), add Garlic (do not burn).
Dice Potatoes and add along with Carrots and Celery as well as 4 cups Water (or more to cover).
Simmer until Potatoes are fork-tender.
Add Cannellini Beans (and optional bean liquid). Continue Simmering.
Steam Kale separately in batches (about 3 minutes per batch) and once completed, add to soup with enough Water/Broth/Stock (and/or the Kale Steaming Liquid) to cover .
Simmer for 30 minutes.
Season to taste.
Optional: Puree some (and add back into the Soup) or Puree all of the Soup. Immersion Blender works great!
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