Take large Pot and add tomatoes in it.

Fill the pot with water, make sure all the tomatoes dip in the water. Add salt in it.

Cook the tomatoes for 10 minutes to blanch them.

After Blanched Rinse with water and peel off the skin of tomatoes and discard the skin.

After cooled completely blend the blanched tomatoes with vinegar and put into the air tight containers.

Place into the freezer, can use upto 6th months.