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|Step_Content=* Éplucher et laver soigneusement les fruits et légumes à pasteuriser | |Step_Content=* Éplucher et laver soigneusement les fruits et légumes à pasteuriser | ||
* Mettre sur le feu les fruits et légumes soit dans une recette de son choix (type ratatouille, compote, purée de fruits ou légumes, fruit au sirop etc) ou directement en morceaux dans de l'eau | * Mettre sur le feu les fruits et légumes soit dans une recette de son choix (type ratatouille, compote, purée de fruits ou légumes, fruit au sirop etc) ou directement en morceaux dans de l'eau |
Tutorial de Low-tech Lab | Catégories : Alimentation, Santé
Preserve your surplus of fruit and vegetables by means of pasteurisation
Preserve your surplus of fruit and vegetables by means of pasteurisation
conserve, légume, gaspillage, alimentaire, pasteurisation, conservation en fr 1
This tutorial has been created in collaboration with Claire Yobé, an expert in pasteurisation with many years of experience in the field.
The aim is to easily preserve surplus fruit and vegetables for long-term storage, whether from your vegetable patch (in Summer for example), or because you have bought more than you need.
Key facts on food wastage:
What is pasteurisation?
Pasteurisation is a process used to preserve food. It consists in heating food to 80°C before being bottled or preserved in jars, followed by cooling.
How is it possible to preserve food by means of pasteurisation?
By heating fruit and vegetables to 80°C, a large proportion of pathogenic micro-orgnanisms are destroyed. Placing food in containers at this temperature drives oxygen out and prevents the remaining pathogens from multiplying.
What kind of foods can be preserved through pasteurisation?
All kinds of fruit and vegetables can be easily preserved by means of pasteurisation. However, this method cannot be applied to meat or fish since 100% of the pathogens present need be destroyed, which can be achieved through sterilisation.
What nutritional value do pasteurised foods have?
Cooking clearly diminishes nutritional value as it reduces the vitamin and protein content in food.
Pasteurisation is one of the heat treatment processes which least reduces nutritional value as the food is not heated to very high temperatures, contrary to sterilisation which can reach temperatures of up to 120°C.
How should we consume pasteurised foods?
You can consume as much pasteurised fruit and as many pasteurised vegetables as you wish. Once the container has been opened, it should be stored in the fridge and the contents eaten within 7 days.
Are there any risks involved with pasteurisation?
As with all heat treatment methods for food preservation, it is vital that the jar or tin be airtight. If air penetrates the container, pathogenic micro-organisms may develop.
This tutorial focuses on fruit and vegetables only where risk is very low. However, if in doubt and any suspicious smells or colours arise, do not hesitate to throw the preserve away.
Remarque: La mise du bocal dans l'eau chaude permet de chauffer le verre pour assurer que tout le contenu reste à 80°C durant le remplissage
Remarques:
1) La validation de la température à 80°C et la fermeture parfaite des bocaux sont 2 étapes essentielles de la pasteurisation
2) Le positionnement du bocal, couvercle vers le bas, permet de valider la bonne étanchéité à l'air (si ça fuit, la conserve n'est pas bonne) et permet de laisser le couvercle se rétracter par le refroidissement dans de bonnes conditions pour une fermeture parfaite
Remarque: Les conserves pasteurisées peuvent se garder ainsi plusieurs mois / années
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