Wash and dry the beans. Remove ends and trim to fit vertically in jars, leaving 1 cm headspace.
Prepare the jars, lids and boiling water bath. Fill each dry clean jar with beans and two sprigs of savory.
In a non-reactive pan, combine the vinegar, water, salt and sugar. Bring to boil over med-high heat, stirring occasionally. Pour the hot liquid into the jars, just covering the beans. Wipe the rims with a clean towel and attach lids securely.
Place jars in boiling water bath, and when water returns to boil, process for 15 minutes.