Abstract: One variation of an apparatus for cooking includes: a housing including a first section configured to be immersed in fluid within a cooking container and a second section adjoining the first section; an annular knob arranged over the second section; a position sensor arranged within the second section and configured to detect rotation of the magnetic element; a display arranged on the housing and configured to display a cooking parameter selected through rotation of the annular knob; a heating element arranged within the first section; a circulator arranged within the housing and configured to draw fluid, in the cooking container, along the heating element; and a controller configured to control the heating element and the circulator according to a temperature of the fluid measured by the temperature sensor, thereby maintaining the fluid within a predetermined range of temperatures including the selected temperature.