Prepare the glass containers: Wash the glass jars thoroughly with hot water and soap. Make sure they are completely clean and sterilized to avoid any contamination.

Prepare the tomatoes: Wash the tomatoes under running water to remove any dirt. Then, remove the stem part and cut them into slices or pieces, as you prefer.

Blanch the tomatoes: In a large pot, boil enough water to completely cover the tomatoes. Once the water is boiling, add the tomatoes to the pot and let them sit for about 1 minute. This will help remove the skins from the tomatoes.

Cool the tomatoes: Remove the tomatoes from the boiling water and immediately plunge them into a bowl of ice water. This will stop the cooking process and help cool the tomatoes quickly.

Remove the skins and seeds: Once cooled, the skins will be loose and easy to remove. Peel the tomatoes and remove the seeds if desired. You can choose to keep the seeds if you prefer.

Place the tomatoes in the mason jars: Fill the mason jars with the prepared tomatoes, leaving about 1 inch of headspace at the top to allow for expansion during freezing.

Add salt and olive oil: To better preserve the tomatoes, you can add a pinch of salt and a drizzle of olive oil to each jar. This will help bring out the flavor and preserve the quality of the tomatoes.

Seal jars tightly: Make sure to seal glass jars tightly to prevent air from getting in and contaminating the tomatoes. You can use screw-on lids or rubber seals, depending on the type of jar you are using.

Store in the freezer: Place the glass jars in the freezer and make sure they are in a stable position. Let them freeze for at least 24 hours before using.

Thaw and use: When you are ready to use the tomatoes, simply remove the jar from the freezer and let it thaw in the refrigerator or at room temperature. The tomatoes will be soft and ready to be added to sauces, soups, stews or whatever you like.