How do you make real Cuban coffee?

This from Wikepedia The sugar is added to the coffee before brewing, and brewed in an espresso machine.

Cuban-style espresso is made by adding raw sugar to the container where the espresso grounds will be brewed with hot water in the espresso machine. This enables the resulting drink to have the strength of espresso, but with a smooth, sweet flavor that is unobtainable by simply mixing sugar into a regular espresso. A proper cafecito should be made using an espresso machine, but it can also be made at home using a stove top espresso maker. There is a misconception that a properly made cafe cubano has a small layer of chocolate brown colored foam, called espumita, at the top. However, any shot of espresso made from a good machine should have the espumita regardless of whether sugar is added to it or not. The misconception exists because users of stove top espresso makers can imitate this effect by mixing the first drops of espresso with sugar to create a paste. When the rest of the espresso is added to the mixture an espumita like substance appears.

Café con leche, or "coffee with milk", a Cuban espresso served alongside a cup of hot or steamed milk. Originally served separately, the cafecito is dumped into the glass of hot milk and stirred in. It is the traditional Cuban breakfast beverage, served with slices of buttered, toasted cuban bread that are dunked in the coffee cup. In addition, traditional Cuban "café con leche" contains a pinch of salt (popularized by the Chinese immigrants who arrived in 19th century Cuba) and a pinch of butter, giving it a unique taste.

Types Of Cuban Coffee

I am a former chef from Canada and have several friends who run places in Florida, one i Miami, I have visited him a number of times and when we go to "Little Havana" and have it is is served like espresso, but with sugar and a glass of water, not milk that is Vietnamese style, I have had it in several cafe there, never ever was even offered milk or cream.

take a boat to Cuba

i think it's really strong expresso poured over sweetened condensed milk.