Broeder (also known as Jan in de Zak and pork) is a traditional Dutch dish whose central ingredient is buckwheat flour.
Broeder is the Dutch word for brother; this is how the dish is commonly known in West-Friesland.
[1] "Jan in de zak", or "John in a bag", refers to the cooking method: the batter is boiled or steamed in a cotton bag;[2] the name is attested in West-Friesland and Drenthe.
[3] The work "pork", attested in Drenthe and Twente as a name for the dish, also means "small child".
[2][4] The batter is poured into a cotton bag (frequently a pillow case), whose inside is floured lightly; the bag is closed and then cooked in a pot of boiling water.