"The great majority of these hotels go Passover kosher, which is dizzying in complexity and scope. No outside food items may be brought in by guests or wait staff, lest it contain leavened products. Kitchen appliances, sinks, and countertops must be made kosher - a process that involves blowtorches and gallons of boiling waters. Special Passover utensils have to be bought. Armies of kosher supervisors called mashgiach have to employed. And absolutely no bread products are allowed."

— Blowtorches, you say? - Why Are Thousands of Jews Selling Their Homes for Passover? - Business - The Atlantic