1. Slice green tomatoes into pint jars.
2. Add 1/2 teaspoon salt to each jar.
3. Cover with boiling water.
4. Put lids on and put in water bath canner.
5. Bring to boil and boil for 5 minutes.
6. Remove from canner, tighten caps and cool on counter top.
7. Can also use quart jars, adding 1 teaspoon salt.