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I believe it is due to the vacuum created inside the can as the paste cools down.

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14y ago

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Does tomato paste expire?

yes The best-before or use-by date will be printed on the container. The expiry date changes when the container is opened and it becomes necessary to refrigerate the tomato paste and use it within a specific time frame. The refrigerated life of the product will be given on the label.


How long can you keep tomato paste in the fridge?

According to the folks at Contadina...Tomato products can be kept in the refrigerator for 2 to 3 days. Remove the balance of the product from the opened can and place it in a container equal in size to the amount of product. Seal tightly. This reduces the amount of air in contact with the tomato product. Air causes oxidation and the product will turn black. But a little olive oil will also keep the air out.


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You should keep foods out of the danger zone to prevent bacteria from forming on foods. Bacteria can form on foods in the danger zone after just an hour. The danger zone is under 145 degrees and over 45 degrees.


What is a hierloom tomato?

An heirloom tomato is an open-pollinated (non-hybrid) heirloom cultivar of tomato.


Does fungi can be found in canned food that is left open for some time?

Yes fungi can be found in canned food that is left open for sometime.


How do you open a can without the noise?

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Should you use heirloom tomatoes Roma tomatoes or tomatoes on the vine to produce the least seeds for making a seedless tomato sauce?

The 'Roma' tomato is not an heirloom. It is however an open pollinated, so it is somewhat like an heirloom, just not old enough to fit the category. 'Roma' is a very good tomato for sauces as is the 'Amish Paste' heirloom tomato. Both of them have very little seed and meaty flesh which is what you want for doing up tomato sauces and salsa.


What is function of can opener?

to open a canned good ;)


How do you open a tomato?

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Where do tomato seeds come from?

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