Quoting: osiol
What is it?
It is a thick layer of cream and custard filling sandwiched between two squares of delicate French puff pastry, with a whiff of brandy to taste.
Taken from: polandforall.com/papal-cream-cake.html
"It was during the 1999 visit to his home town of Wadowice that Pope John Paul II summoned the memories of his younger days. What he said then had a great effect on the whole of the Polish confectionery business. The Pope reminisced about the sweet taste of the cream cake called kremowka which he and his schoolmates used to buy in a pastry shop in the market square."