Fresh herbs, spices and certain aromatic additives that are placed directly in the jar must be briefly heat-treated before use.
The goal is to reduce the number of microorganisms on their surface, while preserving the color, smell and taste as well as possible.
Boiling water is used for this short treatment. It is blanched briefly.
1. Fresh green herbs
A) Hardier plants
Herbs such as rosemary, thyme and similar plants with tougher leaves and stems are placed in boiling water for about 30-60 seconds.
B) More tender plants
Sensitive plants such as basil and mint are processed for a shorter time, about 10-15 seconds.
- Afterwards, the herbs can be cooled briefly in cold water if the goal is to preserve the bright green color.
- Submerge the fresh herbs and spices in cold water for the same number of seconds they spent in the hot water.
- If the herbs are immediately placed in a warm jar, they must be drained well.

