Tomato Purée (in the U.S.) is a thick sauce made from cooked then strained tomatoes. Tomato puree is thinner than tomato paste but thicker and more flavorful than tomato sauce. Tomato sauce has salt and other seasonings added.
Some tomato canning companies pack their whole or chopped tomatoes in tomato puree rather than juice.
In the U.K, tomato puree is what we refer to as tomato paste in the U.S.
You can typically find this in your local grocery store in the same section you'd find other canned tomato products. You can also find it online at Amazon.com in cans, bottles, and Tetra-pak containers: Tomato Puree.
You can easily make your own substitute for tomato puree:
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