How to just sharpen a knife

How to sharpen a knife, when there is neither a grinding wheel, nor sandpaper or other good at hand, what could sharpen a dull knife? Believe me, there is an object for sharpening a knife in almost every kitchen. This is a regular mug! Ceramic or clay does not matter much. &Nbsp;
Aplateorsomeotheritemofkitchenwarecanalsocomeup,themainthingisthattheedgeisfreefromtheglossycoating(enamel)onthereverseside.Seepicture.
Ingeneral,wetaketheknifeinonehand,intothesecondmugandwithreciprocatingmovements sharpenthecuttingedgeoftheknife.
Wecheck.
Cuts perfectly! And do not worry about the dishes - nothing happened to it, not a bit.
PS: After sharpening, you must rinse the knife in water to remove the particles formed during sharpening.Well, respectively, do not forget to wash the mug.