Since three years I use my Slowcooker to cook plum butter. This is very relaxed as I just have to remove the plum pits the night before and turn on the slow cooker. I put the lid on the cooker in a right angle, leaving a gap so the evaporated water can escape. After 12 hours cooking on “High” the juice has reduced a good deal and after pureeing it needs another three to four hours until it reaches the perfect thick consistence.
The dearest one likes his plum butter without a lot of spices, so I add only half of a cinnamon stick and a tiny little bit of a vanilla bean. Just enough to underline the flavour without shining through. And as I use only a bit of sugar, I preserve the glasses of plum butter, just to be on the safe side. Last year I tested Michas Methode with boiling the glasses covered with water in a big pot. It worked like a charm and the plum butter kept well for one year.