Food warmers can be costly, and many people can't justify the cost of buying one if they only need it for one event. Even if you will use a food warmer often, you can make your own with candles. Making a food warmer is an inexpensive alternative to buying a traditional food warmer and can be just as safe.
Set the disposable roasting pan onto the surface you plan to serve the food from; you won't be able to move it once you light the candles. You can buy this type of pan from the aluminium-foil section of your local grocery store.
Place the tea-light candles into the roasting pan, making sure they are evenly spaced.
Put the baking rack on top of the roasting pan. It needs to sit evenly, or you risk the food falling off.
Set the food you want to keep warm on top of the rack. Look into the roasting pan, and see whether the tea-light candles are centred underneath the pan. If not, you will need to centre them.
Remove the pan of food and the baking rack. Light the tea lights, and then place the rack and food back on top of the roasting pan to keep it warm.
Use unscented tea lights; you don't want scented candles mixing with food. If you're using a heavy pan of food, you will need to use a traditional roasting pan instead of a disposable one.