Transfer the sweet potatoes and mild curry powder to a blender or food processor and puree for 1-2 minutes on high or until you reach your desired consistency, adding reserved water, breast milk, formula, water or broth in 1/4 increments if needed. I had to add 1 1/2 cups of reserved water to the puree above. Sweet potatoes are a very dense root vegetable so they will always need more liquid then you would think.