Special days and remembrances in Zuid-Holland, on which you may serve these dishes, are 8 February, when Prince William of Orange established the University of Leiden in 1575, 1 April, when the Dutch Sea Baggers conquered Den Briel from the Spaniards, 13 May, Johan van Oldebarneveldt, a famous politician from The Netherlands, was executed and 3 October 1619, when the month long siege of Leiden by the Spanish ended (in 1574). Click on culinary calendar for more links between history and cooking.