My Yacon harvest
Since yacon syrup is very expensive - you would pay between $20 and $ 30 for a small 250 ml jar - I thought why not make some yacon syrup myself, who could eat all that yacon anyway? This is the harvest from two, rather untended beds, roughly three metres long. I planted them in autumn because I did not want to store the crowns. The beds were unmulched and I guess the frost killed quite some of the crowns. This is NOT the method commonly described in gardening books. I harvest my tubers when the frost kill the plants.
Preparing the tubers:
The first thing is to wash them with a hose to get rid of as much dirt as possible. Unfortunately, I did not get around to turn the yacons ito the syrup for about two weeks and that might have altered my product.
Yacon syrup principles and processing states that: "soon after harvesting a rapid transformation of the composition of the sugars occurs: the FOS (dpecial sugars) are hydrolyzed by an enzyme calledfructan hydrolase into simple sugars (i.e. fructose,glucose and sucrose). After a week of storage at room temperature, approximately 30 – 40% of the FOS will have transformed into simple sugars. This process is much slower if the roots are kept at lowertemperatures under refrigeration." At least it was colder and night temperatures dropped around freezing.
All recipes available in the net tell to peel the tubers, what I did I brushed them firmly as for potatoes and omitted the peeling, but scrubbing them thoroughly is not much less work.
Juice the yacon and concentrate the juice:
The next step is to cut up the tubers to extract the juice. We got two large pots, more than twenty litres in total. Thankfully we have wood fire, because the juice has to be boiled down to roughly a quarter of the initial quantity it took about two days, but the fire was not on all the time. The result something that tastes a bit like Molasses but is way more runny. To be honest: nice and sweet but I would not spend that much money on it. Maybe I should try a commercial syrup for comparison.
Here's the link to the paper on the commercial extraction of yacon syrup: http://cipotato.org/wp-content/uploads/2014/07/1919-Yacon_Syrup.pdf
How is your yacon syrup like?