Root Vegetable Purée
One of the first combined purées I made for my daughter was steamed root vegetables blended until smooth. Once she had tried sweet potato, parsnip, butternut squash & carrot, I would blend them all together for a mixed root vegetable puree.
You can also add a measure of homemade vegetable stock, or chicken stock, for extra nutrition (boiling water is fine too if you don't have any homemade, or no salt added stock).
Pro Tip
This also makes a great soup for yourself too, just add more stock and season to taste. You can also bulk up this purée by adding some cooked baby pasta.