Bacteria need water, so drying out food prevents them from multiplying.
Suitable for: onions, top fruit, veg fruits, tomatoes, pods and cobs. Use within six months.
● Core apples, then slice into rings and soak in salt water. String the rings on washing lines indoor, well spaced apart, for three to five days. Use this technique for chillies and mushrooms too, but drying times will vary.
● Cut tomatoes in half, then cover with salt and dry them on baking parchment in the oven. Store in jars of olive oil.
● Slice onions, dip in boiling water for 30 seconds, then dry on baking trays.
● You can buy a dehydrator for around £50, or use an oven on a low heat.