A professional who operates cooker and mashing tub to cook and combine cereal, such as corn or rice, and malt to produce wort. Respnsibilities include:

• Opens slide gate on scale hopper to fill cooker and tub with measured amounts of malt and cereal.
• Starts pumps and turns valves to admit hot water into cooker and tub.
• Starts power-rakes that mix cereal and water in cooker, and malt and water in tub.
• Ignites burners to cook cereal and mash over controlled cooking cycle.
• Turns outlet valve on cooker and starts pump that transfers cereal mash to tub.
• Turns valve that admits steam into tub to heat mash to specified temperature.
• Starts power-rake that mixes mash.
• Adds iodine to sample of mash and examines color to determine degree of saccharization.
• Turns outlet valve to transfer cooked mash to filter press or lautertub.
• Washes mashing tub and cooker, using high-pressure water hoses and cleaning solutions.
• Records mash temperature, steam pressure, and degree of saccharization.