Baked milk is a variety of boiled

Boiling

Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding environmental pressure. While below the boiling point a liquid...

 milk

Milk

Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to the baby and can reduce the risk of many...

 that has been particularly popular in Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 and Ukraine

Ukraine

Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

. It is made by simmering

Simmering

Simmering is a food preparation technique in which foods are cooked in hot liquids kept at or just below the boiling point of water , but higher than poaching temperature...

 milk on low heat for eight hours or longer.

In rural areas baked milk has been produced by leaving a jug of boiled milk in an oven for a day or for a night until it is coated with a brown crust. The stove

Stove

A stove is an enclosed heated space. The term is commonly taken to mean an enclosed space in which fuel is burned to provide heating, either to heat the space in which the stove is situated or to heat the stove itself, and items placed on it...

 in a traditional Russian loghouse (izba

Izba

An izba is a traditional Russian countryside dwelling. A type of log house, it forms the living quarters of a conventional Russian farmstead. It is generally built close to the road and inside a yard, which also encloses a kitchen garden, hayshed, and barn within a simple woven stick fence...

) sustains "varying cooking temperatures based on the placement of the food inside the oven".
Today, baked milk is produced on an industrial scale, as is soured or fermented baked milk, traditionally known as ryazhenka . Like scalded milk

Scalded milk

Scalded milk is milk that has been heated to . At this temperature, bacteria and enzymes in the milk are destroyed. Since most milk sold today is pasteurized, which accomplishes both of these goals, milk is typically scalded simply to increase its temperature, or to change the consistency due to...

, it is free of bacteria

Bacteria

Bacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...

 and enzyme

Enzyme

Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical reactions in a biological cell need enzymes in order to occur at rates...

s and can be stored safely at room temperature for up to forty hours. Home-made baked milk is used for preparing a range of cakes, pies, and cookies.

Caramelized sweetened condensed milk

Condensed milk

Condensed milk, also known as sweetened condensed milk, is cow's milk from which water has been removed and to which sugar has been added, yielding a very thick, sweet product which when canned can last for years without refrigeration if unopened. The two terms, condensed milk and sweetened...

is a similar preparation used in home-made pastries, often prepared by prolonged heating of unopened cans of condensed milk.