I found some jars of sour cherries in Lidl & had to have them to make a beer with. While it will have some resemblance to a Belgian Kriek, it is not soured with wild yeasts or bacteria. The sourness will come from acid malt predominantly.
Mash: 1 hour 10 mins starting at 70°C & falling to 57°C at the end.
2 Kg pale malt