Anastazja Pustelnik FDC (13 October 1950 – 4 October 2026), born Krystyna Pustelnik was a Polish nun who belonged to the Daughters of Divine Charity, and a cookbook author under the name "Siostra ('Sister') Anastazja".
Life and work Pustelnik's father died when she was six months old. She began cooking at the age of 17, after her mother's death. For two years, she worked at a glassworks in Vsetín, Czechoslovakia. In 1973, she joined a religious order. There, she cooked for disabled children and later for the Jesuit community in Kraków. Pustelnik wrote 17 cookbooks, the first of which was Sister Anastasia’s 103 Cakes. By 2017, the total number of copies of her books sold had reached 4 million. Pustelnik's books are sold at locations such as post offices. According to Newsweek, the popularity of books such as those by Pustelnik testifies to the progressive emancipation of Polish female religious orders, which began in the 1990s.
In 2018, she retired and took up residence in a convent in Wola Justowska. In 2019, she received a Special Feniks Award.
In 2019, the publisher Wydawnictwo WAM published a biography of Pustelnik by Sławomir Rusin, titled Siostra Anastazja: Życie pełne smaku (Sister Anastazja: A Life Full of Flavour).
She died on 4 October 2026, at the age of 75 after a battle with cancer.
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