How Do I Make My Own Tomato Paste?
To make tomato paste, start by blanching tomatoes in boiling water for 30 seconds, then transferring them to an ice bath to cool. Peel off the skins and remove the seeds. Place the tomatoes in a blender or food processor and puree until smooth. Pour the puree into a pot and simmer on low heat until it has thickened, stirring occasionally. This can take anywhere from 2 to 4 hours, depending on how much water needs to evaporate. Once the puree has reached the desired thickness, transfer it to a jar and refrigerate or freeze.