'Farmor på höga berget' (Swedish for "Grandmother on the high mountain") is Bamses grandmother and dopedealer (see the 'dunderhonung' part below). She lives on top of a very high mountain where she makes pancakes and dunderhonung ("rumblehoney"). When Bamse eats the dunderhonung he becomes the strongest bear in the world. If anybody else (except for Surre, Bamses pet bee) should eat the dunderhonung that person gets a stomachache for (exactly) three days1.

1The exception being Brummelisa, Bamse's daughter - she gets stomachache AND becomes stronger.