This is my first try making these and I think I need a bit of practise to tightly pack the jars. My Italian friend guarantees its success. I used roma tomatoes.
1. Wash the tomatoes and cut into 4 lengthways.
2. Scoop out the seeds.
3. Pack these tomato quarters into a sterilised jar with a wide mouth (Agee jars are good). Use a clean wooden spoon to push out all the air between the pieces. When full, tightly close the lid.
4. Wrap the jars in newspaper to stop them banging against each other. Place them into your biggest pot and cover with cold water. The water must submerge the jars by at least an inch. Bring to the boil, boil for 30 minutes then turn off the heat and allow to completely cool before removing the jars. Store in a cool dark place.