<P> Eggs can also be soaked in mixtures to absorb flavor . Tea eggs are steeped in a brew from a mixture of various spices, soy sauce, and black tea leaves to give flavor . </P> <P> Careful storage of edible eggs is extremely important, as an improperly handled egg can contain elevated levels of Salmonella bacteria that can cause severe food poisoning . In the US, eggs are washed, and this cleans the shell, but erodes the cuticle . The USDA thus recommends refrigerating eggs to prevent the growth of Salmonella . </P> <P> Refrigeration also preserves the taste and texture . However, intact eggs can be left unrefrigerated for several months without spoiling . In Europe, eggs are not usually washed, and the shells are dirtier, however the cuticle is undamaged, and they do not require refrigeration . In the UK in particular, hens are immunized against salmonella, and the eggs are generally safe for 21 days . </P> <P> The simplest method to preserve an egg is to treat it with salt . Salt draws water out of bacteria and molds, which prevents their growth . The Chinese salted duck egg is made by immersing duck eggs in brine, or coating them individually with a paste of salt and mud or clay . The eggs stop absorbing salt after about a month, having reached osmotic equilibrium . Their yolks take on an orange - red color and solidify, but the white remains somewhat liquid . They are often boiled before consumption, and are often served with rice congee . </P>

Where does the fat in eggs come from