The Modern Kitchen

OU Kosher Staff
Click here for a visual guide
GLOSSARY OF TERMS
LIBUN – Burning
HAGALAH – Boiling
IRUY – Poured Boiling Water
EVEN MELUBENET – Heated Stone

SILVERWARE, POTS & OTHER SMALL ITEMS

HAGALAH

Rolled lips, seams or cracks, which cannot be cleaned, will require torching of those areas. Utensils should be immersed one at a time into a pot of boiling water that is on the fire. Water should be allowed to return to a boil before next item is placed into the pot. The pot can be non-Passover, provided it is clean and has not been used for 24 hours.

Larger items can be submerged in the water one part at a time. Utensils should then be rinsed in cold water.

STAINLESS STEEL SINK

IRUY

Remove drain. [It is recommended that the drain be replaced. If this is difficult, and the drain has large holes and can be completely scrubbed clean, then it can be kashered. It should not be used for 24 hours. It should be boiled in a clean chametz pot that was not used for 24 hours.] It is preferable to kasher a sink by pouring boiling water in conjunction with an even melubenet. In lieu of kashering with a heated stone, some place a rack on the bottom of the sink, or use a sink insert.

CERAMIC SINK

MUST BE COVERED

The sink should not be used with hot water for 24 hours. Remove drain. [See drain instructions under stainless steel sink.] The sink should be completely clean and dry. The sink should be covered with layers of contact paper, foil,, or, even better, purchase a sink insert.

GAS STOVE

LIBUN & COVER

Clean the stovetop surface and grates well. Don’t use for 24 hours. Cover the stovetop surface with foil. Replace the grates or burn them in the oven at 550° F for one hour. ELECTRIC STOVE LIBUN & COVER Clean the stovetop surface well. Cover with foil. Turn the burners on until they glow red. GLASS STOVE MUST BE COVERED Clean the stovetop surface well. Don’t use for 24 hours. During Passover, pots shouldn’t be placed directly on the stove surface, but rather place an aluminum or metal disc directly under the pot. Note: One should not cover the entire glasstop surface as this might cause it to overheat and crack.

KEURIG COFFEE MAKER

HAGALAH OR IRUY

Remove K-cup holder, and clean very well. Perform hagalah or iruy on K-cup holder. Run a Kosher for Passover K-cup in the machine.

SELF-CLEAN OVENS

LIBUN

Remove any visible food. Complete self-cleaning cycle with racks in place.

NON SELF-CLEANING OVEN

LIBUN

Clean all surfaces (walls, floor, doors and racks) thoroughly with a caustic cleanser (e.g., Easy Off). Pay special attention to thermostat, oven window, and edges of the oven chamber. Black discoloration that is flush with the metal need not be removed. Oven should not be used for 24 hours. Place racks in the oven and turn the oven to broil (highest heat) for 90 minutes. A broiler pan that comes in direct contact with food should not be used.Note: The method of kashering described above is based on the ruling of Rav Aharon Kotler zt’l. However, Rav Moshe Feinstein zt’l ruled that the oven must either be kashered with a blow torch, or an insert should be placed in the oven. Consult your rabbi for guidance.

WARMING DRAWERS

LIBUN

Warming drawers don’t get to libun kal temperature. Unless one is experienced in kashering with a torch, they are not recommended for use on Passover.

TABLECLOTHS, OVEN MITTS, APRONS & OTHER FABRIC ITEMS

WASH

Fabric items can be kashered by washing them with detergent in washing machine set on hot. Check items to ensure that no pieces of food remain attached

MICROWAVE

HAGALAH

Glass turntable should be removed and replaced with new kosher for Passover surface. A clean drinking glass, unused for 24 hours, should be filled with water and boiled in the microwave for 10 minutes The cup should be refilled and moved to another spot and the process repeated for 10 more minutes. Cardboard or contact paper should be taped over the glass window pane for the duration of Passover.

THE SINK FAUCET (& INSTANT HOT)

IRUY

Detach any filters or nozzles. Remove drain.

GRANITE COUNTER TOPS

IRUY OR COVERING

It is preferable to kasher a countertop by pouring boiling water in conjunction with an even melubenet.

OTHER COUNTER TOPS

MUST BE COVERED

Ceramic tile counters cannot be kashered. The counter should be cleaned well and covered with a water-resistant covering.

REFRIGERATORS, FREEZERS, FOOD SHELVES & PANTRIES

CLEAN & COVER

These areas should be thoroughly cleaned, paying special attention to the edges where crumbs may be trapped. The surfaces should be lined with paper or plastic. Note: Refrigerator and freezer will operate more efficiently if holes are poked in the lining to allow air flow.

DISHWASHERS

HAGALAH

Kashering of dishwasher is a complicated process and should only be done in consultation with a halachic authority. Clean all surfaces and leave idle for 24 hours. Run a heated cycle of the dishwasher with soap. Then, run a heated dish washing cycle. Boil large pots of water on stove and pour into the dishwasher in the middle of the heated cycle.

TABLES

MUST BE COVERED

Although wooden tables can be kashered, the common custom is to clean the tables well and then cover them.

WATER COOLER

IRUY

Replace with new water bottle. Run hot water through the water tap for one minute. Pour boiling water from a kettle over water tap.

CLICK ON THE TO FIND OUT HOW TO KASHER EACH ITEM.
GLOSSARY OF TERMS
LIBUN – Burning
HAGALAH – Boiling
IRUY – Poured Boiling Water
EVEN MELUBENET – Heated Stone
Click here for more details on these processes.
SILVERWARE, POTS & OTHER SMALL ITEMS HAGALAH Rolled lips, seams or cracks, which cannot be cleaned, will require torching of those areas. Utensils should be immersed one at a time into a pot of boiling water that is on the fire. Water should be allowed to return to a boil before next item is placed into the pot. The pot can be non-Passover, provided it is clean and has not been used for 24 hours. Larger items can be submerged in the water one part at a time. Utensils should then be rinsed in cold water.
STAINLESS STEEL SINK IRUY Remove drain. [It is recommended that the drain be replaced. If this is difficult, and the drain has large holes and can be completely scrubbed clean, then it can be kashered. It should not be used for 24 hours. It should be boiled in a clean chametz pot that was not used for 24 hours.] It is preferable to kasher a sink by pouring boiling water in conjunction with an even melubenet. In lieu of kashering with a heated stone, some place a rack on the bottom of the sink, or use a sink insert. CERAMIC SINK MUST BE COVERED The sink should not be used with hot water for 24 hours. Remove drain. [See drain instructions under stainless steel sink.] The sink should be completely clean and dry. The sink should be covered with layers of contact paper, foil,, or, even better, purchase a sink insert.
GAS STOVE LIBUN & COVER Clean the stovetop surface and grates well. Don’t use for 24 hours. Cover the stovetop surface with foil. Replace the grates or burn them in the oven at 550° F for one hour. ELECTRIC STOVE LIBUN & COVER Clean the stovetop surface well. Cover with foil. Turn the burners on until they glow red. GLASS STOVE MUST BE COVERED Clean the stovetop surface well. Don’t use for 24 hours. During Passover, pots shouldn’t be placed directly on the stove surface, but rather place an aluminum or metal disc directly under the pot. Note: One should not cover the entire glasstop surface as this might cause it to overheat and crack.
KEURIG COFFEE MAKER HAGALAH OR IRUY Remove K-cup holder, and clean very well. Perform hagalah or iruy on K-cup holder. Run a Kosher for Passover K-cup in the machine.
SELF-CLEAN OVENS LIBUN Remove any visible food. Complete self-cleaning cycle with racks in place. NON SELF-CLEANING OVEN LIBUN Clean all surfaces (walls, floor, doors and racks) thoroughly with a caustic cleanser (e.g., Easy Off). Pay special attention to thermostat, oven window, and edges of the oven chamber. Black discoloration that is flush with the metal need not be removed. Oven should not be used for 24 hours. Place racks in the oven and turn the oven to broil (highest heat) for 90 minutes. A broiler pan that comes in direct contact with food should not be used.The method of kashering described above is based on the ruling of Rav Aharon Kotler zt’l. However, Rav Moshe Feinstein zt’l ruled that the oven must either be kashered with a blow torch, or an insert should be placed in the oven. Consult your rabbi for guidance. WARMING DRAWERS LIBUN Warming drawers don’t get to libun kal temperature. Unless one is experienced in kashering with a torch, they are not recommended for use on Passover.
TABLECLOTHS, OVEN MITTS, APRONS & OTHER FABRIC ITEMS WASH Fabric items can be kashered by washing them with detergent in washing machine set on hot. Check items to ensure that no pieces of food remain attached
MICROWAVE HAGALAH Glass turntable should be removed and replaced with new kosher for Passover surface. A clean drinking glass, unused for 24 hours, should be filled with water and boiled in the microwave for 10 minutes The cup should be refilled and moved to another spot and the process repeated for 10 more minutes. Cardboard or contact paper should be taped over the glass window pane for the duration of Passover.
THE SINK FAUCET (& INSTANT HOT) IRUY Detach any filters or nozzles. Remove drain.
GRANITE COUNTER TOPS IRUY OR COVERING It is preferable to kasher a countertop by pouring boiling water in conjunction with an even melubenet. OTHER COUNTER TOPS MUST BE COVERED Ceramic tile counters cannot be kashered. The counter should be cleaned well and covered with a water-resistant covering.
REFRIGERATORS, FREEZERS, FOOD SHELVES & PANTRIES CLEAN & COVER These areas should be thoroughly cleaned, paying special attention to the edges where crumbs may be trapped. The surfaces should be lined with paper or plastic. Refrigerator and freezer will operate more efficiently if holes are poked in the lining to allow air flow.
DISHWASHERS HAGALAH Kashering of dishwasher is a complicated process and should only be done in consultation with a halachic authority. Clean all surfaces and leave idle for 24 hours. Run a heated cycle of the dishwasher with soap. Then, run a heated dish washing cycle. Boil large pots of water on stove and pour into the dishwasher in the middle of the heated cycle.
TABLES MUST BE COVERED Although wooden tables can be kashered, the common custom is to clean the tables well and then cover them.