Preserve the best of summer with this French rainbow ratatouille in a jar. Enjoy simply with salt, pepper and basil leaves when ready to serve.
Place a trivet (or a clean cloth) inside a large saucepan and place the jars upright on top. Fill up the saucepan with water up to half the height of the jars and bring to the boil. Lower the heat and simmer for 45 minutes or until the lids seal themselves. Once sealed, remove from the saucepan using tongs and place somewhere to cool. Store.