Description

pourquoi mettre les pots de confiture à l’envers ?

When making jam, it’s essential to understand why turning the jars upside down is a crucial step. Here’s a concise explanation:

1. **Air Trapping and Vacuum Seal**: When hot jam is poured into a jar, air is trapped inside. Turning the jar upside down allows this air to escape, creating a vacuum seal. This seal prevents air from re-entering, which can lead to spoilage.

2. **Sterilization**: The heat from the jam helps kill any bacteria that might have entered when the jar was sealed. This step is crucial for ensuring the jam remains safe to eat.

3. **Preventing Spoilage**: The vacuum seal created by turning the jar upside down inhibits the growth of mold and bacteria, extending the shelf life of the jam.

4. **Duration**: Typically, jars should be left upside down for about 10-15 minutes to allow the seal to set properly.

This method isn’t just for jam; it’s applicable to other preserves like pickles and chutneys, making it a standard preservation technique. By following this step, you ensure your homemade preserves stay fresh and delicious for longer.