Recipe developed by Jenny Tschiesche BSc(Hons) Dip(ION) FdSc BANT. For more information see www.jennytschiesche.com.

To prepare jars, thoroughly wash jars and lids in hot, soapy water. Rinse by pouring over boiling water. Prepare for filling, if needed, by placing on a clean tea towel in a roasting tin and heating in the oven at 100˚C until required.

Frozen banana pieces can also be used. Blend for longer in step 3 until smooth. For easy blending, freeze bananas in individual slices on a flat baking tray.