Question: how to convert tomato paste to tomato puree?
Answer: Use Tomato Paste as a Tomato Puree Substitute You can dilute a can of tomato paste to make a substitute for tomato puree. Open the can of tomato paste. Measure out 1/4 to 1/3 cup of the paste and mix with 3/4 cup water. To mask any metallic flavor, heat a little oil and add the puree.