Belyov Pastila made of only thee components: baked in wood stove apples, egg whites and sugar.
From time immemorial, there was a problem of saving huge apple harvests in Russia.
Wise peasants manage to bake apples, grind it, beat it with egg whites, honey, and dry it on "slow heat" in cooling off Russian wood stove. Later, in the end of 19th century sugar became available and used instead of honey.
Between 19th and 20th century industrial production of the pastila situated in Belyov of Tula region, Kolomna and Rzhev cities. After revolution in 1917 productions were lost and only locals were still making the sweet which used to be popular not only in Russia but also in Europe and some American and Australian cities.