Tomato paste can be found in every kitchen and almost every dish, but all the recipes require only one or two tbsp. of the tomato paste for the entire dish so the rest of the tomato paste should be put into storage for later use, either in the fridge, or freezer but if it is not properly stored the tomato paste will become unusable and should be thrown out. 
Imagine opening the fridge door to pick up the tomato paste can you put in there a few days ago that you now need for the spaghetti sauce you’re trying to make and after opening the can instead of tomato paste you are faced with a white hairy blanket covering a black-ish paste that used to be the tomato paste that you only removed a couple of tbsp. from and put back in the fridge for later use. There are times that running to the store and buying another can of tomato paste is not doable so storing the tomato paste properly is key to avoid wasting tomato paste and being left with no tomato paste with a recipe that you can not substitute anything for it. Tomato paste can be kept for a few months if it is stored properly and if you store it unopened you can even keep it for longer. But as long as the tomato paste is put in the fridge like like any other product you buy from the market, it will mold, it will turn black, and it will spoil and ruin your night. 
How long does tomato paste last in the fridge
In the refrigerator, how long does tomato paste last? If properly maintained in an airtight container or in the factory-sealed tube packing, tomato paste can be kept in the refrigerator for seven to ten days. But tubed tomato paste can keep for up to a month in the refrigerator. To retain its flavor and shelf life, the paste should be refrigerated after opening whether it is in a can, a glass jar, or a tube. The tomato may be kept in the refrigerator for up to 10 days after being removed from the can and placed in an airtight portioned container. This also applies to paste that is in a tube or glass jar, although there is no requirement that it be placed in a container. It may be stored in its original container as way, directly in the refrigerator. 
Can tomato paste spoil? Yes, if they aren't stored correctly, they can spoil soon. The state of any leftovers depends on how long you kept them at room temperature or in the refrigerator.
How can one detect whether a tomato paste is bad?
Tomato paste is a very simple and clear warning indication when it has spoiled. Check the color first; if it seems off or is no longer as brilliant as it was when you first opened it, just toss it away. You can try tasting a little amount of the paste to check for the presence of any sour or bitter flavors if the paste smells good and the color is normal. If not, it is okay to use; if not, discard it. A further indication of deterioration is mold development. Throw away tomato paste if it exhibits any sign of mold. 
How to store tomato paste without a fridge
If everything is done correctly, one may guarantee one year of storage for fresh tomato paste using this approach. What you require is
- tomatoes
- Jam jar (they must be glass jars with metallic caps, any other material will not work).
Step 1. You don't need to press the water out unless the tomato is spoiled; instead, blend it or take it somewhere where it's ground in bulk. Step 2 Put the tomato paste in a saucepan (small or big depending on the amount blended). Boil the tomato until all of the water has been removed and it has turned into a paste (try not to let it burn). 
Step 3 Allow it to cool. Fill a jam jar with paste until it is completely full, then tightly lid it. Step 4 Put the sealed tomato paste into a saucepan of water and soak it entirely. Allow the water in the saucepan to come to a boil before letting it continue to boil for 10 to 15 minutes (don't worry, it won't break). Remove them from the saucepan and let them cool. Put them in boxes and keep them somewhere cold and dry. Fridge not required. IMPORTANT NOTE
- BE SURE THE JAM JARS ARE COMPLETELY SUBMERGED BEFORE BOILING, NO MATTER HOW MANY YOU PUT IN THE POT OF WATER.
- JAM JARS THAT WERE OPENED WITH KNIVES AND THE CAPS ARE DAMAGED PR DEFORMED WILL NOT WORK. Jam jars that have been routinely opened will only function because they are still airtight.
- After you've opened the jar, use what you need and put it in the fridge.
How long does tomato paste last in the freezer
Why freeze tomato paste Tomato paste may be conveniently frozen for later purposes. The precise number of tablespoons required for a certain recipe may be retrieved. I believe it will ultimately save me money. Don't waste. Don't want.
How to freeze tomato paste
Measure out 1 tablespoon of tomato paste using a tablespoon measuring spoon or a tiny cookie scoop. On a baking sheet, place the pieces, and freeze them until firm. Place frozen chunks in a freezer bag and keep them there until you're ready to use them. 
Tips: For simple release, lightly coat the cookie scoop or measuring spoon with non-stick cooking spray. Before freezing, cover the baking sheet with a piece of plastic wrap. This makes it easier for the chunks to stay off the baking sheet as they freeze. For simple release, lightly coat the cookie scoop or measuring spoon with non-stick cooking spray. Before freezing, cover the baking sheet with a piece of plastic wrap. This makes it easier for the chunks to stay off the baking sheet as they freeze. Instructions Scoop out tomato paste onto a half-sheet baking sheet using a tiny cookie scoop or a tablespoon measuring spoon. 
Place the baking sheet in the freezer and wait until pieces of tomato paste are frozen. Fill a freezer-safe bag with chunks of solid tomato paste. Lock bag. When ready to use, put back in the freezer. To make it simpler to remove the baking sheet from the freezer, you can cover it with plastic wrap before freezing.
What to do with leftover tomato paste
Do you find it annoying that this recipe only calls for a small amount of tomato paste from a teeny-tiny can? The vast majority of the time, we are at a loss for what to do with it, and as a result, we store it in the furthest corner of my refrigerator, half covered in plastic wrap. 
We didn't find it for a few weeks, but when we did, it had a thin layer of mold on top. We decided to throw it out, which made us feel wasteful and annoyed. If you are left with any tomato paste and you just want to put it in the fridge but you are worried that the tomato paste is going to go bad and you will have to throw it out, you have to options, either freeze the remaining tomato paste like showed here or use it to make some recipes you have been wanting to try but haven’t had the time to do so. But because we are aware of how simple it is to preserve the leftovers, we don't feel awful about using a few tablespoons of tomato paste here and there.
Tomato paste freezing instructions
What you should do is: Scrape the remaining tomato paste into a small, freezer-safe zipper baggie and label it "Tomato Paste" with the date using a Sharpie (which you should always have in your kitchen junk drawer). 
Release all of the air. Seal it. Afterward, put it in the freezer. Next time you only need a tiny bit of tomato paste, take it out and break off a piece that is roughly the size of 1 tablespoon or whatever else the recipe calls for (don't worry about accuracy; tomato paste isn't an ingredient that needs to be measured precisely like baking powder or baking soda). Although you may also freeze tomato paste in ice cube trays, I think this approach with the zipper top bag is more expedient, simpler, and less messy.
How to thaw frozen tomato paste
Prepare the tomato paste in Step one On a plate or baking sheet that has been wrapped in plastic wrap, drop dollops of your remaining tomato paste equal to 1 tablespoon over the surface. The tomato paste will be wrapped in plastic wrap and placed inside a freezer bag to prevent it from clinging to the dish as it freezes. 
To ensure that the dollops freeze separately and are simple to divide into 1-teaspoon portions later, make sure they are not touching. Place the plate or baking sheet, uncovered, in the freezer for two to three hours, or until the dollop is completely frozen.
Transfer the tomato paste in step two
The tomato paste keeps its individual lumps better when frozen uncovered on a level surface, but if you do it for too long, it may dry up and develop freezer burn. In order to store them for a long time, you must move them to an airtight container as soon as they are firm. I used a freezer bag that was quart size and labeled it with the contents. Put the package inside the freezer bag after lifting the plastic wrap from the plate, and wrapping it around the balls. The balls won't fuse together if you merely wrap them in plastic since they are already frozen firm. 
Freeze for long-term storage in step three. Before sealing, remove as much air from the bag as you can, then put it back in the freezer. Now, if you need some tomato paste for a dish, just grab one or more lumps! I found that they keep well in the freezer because tomato paste naturally has a low moisture level. Since I use tomato paste frequently, I've never kept any in the freezer for more than 4-5 months, but up until that point, it's always held its quality. Defrosting How about it then? In your freezer is pre-measured tomato paste that is ready for use. The lumps are so little that I normally just add them directly from the freezer to whatever soup or sauce I'm using them in. They quickly dissolve and blend in. 
Freeze tomato paste in ice cube trays
Tomato paste is able to be frozen. It really freezes fairly nicely and resists freezer burn easily since it has a very low water content. However, it needs to be wrapped carefully to prevent absorbing tastes from other foods in the freezer. When using tomato paste from a metal can, the tomato paste must be taken out of the can before freezing. When freezing tomato paste, it is advisable to use fresh tomato paste and to freeze it as soon as possible after opening. When the tomato paste is opened, keep it in the fridge until you're ready to freeze it. To prevent having to thaw huge amounts of tomato paste at once and running the danger of having any remaining, it could be best to freeze tomato paste in single-use serving sizes. An ice cube tray and a spoon are required for this. 
Put each scoop of tomato paste onto an ice cube tray, roughly 1 big spoonful at a time. The ice cubes should completely freeze in the ice cube tray. Pop out the tomato paste cubes from the tray after removing it from the freezer. In a small freezer bag, put the cubes. Remove any extra air from the bag, then close it. Date and label the bag. In the freezer, tomato paste may be stored for up to a year without losing flavor or texture. 
You may also just scoop out the full contents of the jar and put it in a freezer bag. Squeeze the extra air out. Before putting the bag in the freezer, seal and label it.