Jacinta Nandi's new collection of short stories, The Worst Housewife in the World, draws on her life as a mother of two sons, the duties and burdens of everyday life, and the demands of society – and on how all this is connected with feminism. The reader learns a great deal about Germany, which Jacinta Nandi knows so well precisely because it has always remained a little bit foreign to her. Frédéric Valin talked to her about cheese on toast, care work, and Brexit