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It's something a lot of people of probably are probably guilty of; throwing away that left over bit of Tomato Paste. Unless you're cooking for the military there's just no way you will likely use it all in one recipe. We have good intentions leaving a covered can or food storage container in fridge, but more than likely it will end up in the back of the shelf until you find it moldy, on one of your fridge clean outs.
This week Smith's (or your other Kroger affiliate store) has the large 12 oz. cans of Contadina Tomato Paste on sale for $1.00. That's twice the size of your normal little cans you're probably familiar with. While there isn't a coupon currently even without that's a respectable price that saves about 1/2 over the small cans.
I learned this little tip of freezing left over Tomato Paste in ice cube trays back in the '80's during my Tupperware Lady days and have been doing it ever since. A regular tray holds exactly 2 Tablespoons, which is just perfect for most recipes.
Start by spraying your tray VERY lightly with cooking spray. While this step is skippable, it does seem to help them release and helps keep your tray from staining.
Spoon your paste in each section of the tray. Cover and freeze until solid. Overnight is best.
You can store it covered in the tray if you like. I prefer to put my in a food storage bag. It will keep for up to 6 months if covered properly.
Did you know that tomato paste is a source of several nutrients and actually has some compounds that are not highly available in raw tomatoes, making it a very healthy addition to recipes. Next time you have a little left over or find yourself with a large can, don't toss the leftover.