Ristretto: (Ristretto in Italian means "restricted, shrunk or short”) It is the richest and most concentrated espresso drink where less water but the same amount of coffee is used to make the beverage and creates a less bitter espresso. The extraction time is shortened producing as little as 3 oz of liquid per serving. Pure and intense espresso served in a demitasse cup.
The SCAA recommends that a home coffeemaker's brewing water reach the ideal temperature to properly whip up a tasty cup. Specifically, the association says a machine's brew temp should hit 197.6 degrees Fahrenheit within the first minute brewing and not exceed 204.8 degrees. Also crucial is for a coffeemaker to expose its grounds to water between 4 and 8 minutes.
Because the ground coffee beans in cold-brewed coffee never come into contact with heated water, the process of leaching flavor from the beans produces a chemical profile different from conventional brewing methods.[14][15] Coffee beans contain a number of constituent parts that are more soluble at higher temperatures, such as caffeine, oils and fatty acids. Brewing at a lower temperature results in lower acidity and lower caffeine content when brewed in equal volume.[16][17] It is around 65 to 70 percent less acidic than hot drip coffee or espresso, per part.[14] Although less caffeine is extracted with the cold brew method, a higher coffee-to-water ratio is often used, between 2 and 2 1/2 times. This may compensate for this difference in solubility, resulting in a brew with equal, if not more, caffeine (although this is unlikely).[17][18]
You’re less likely to develop liver cancer (see above). It also works well to reduce your chances of colorectal cancer. People who drink 4-5 cups (24 – 30 oz.) of black coffee a day have a 15% lower risk of colorectal cancer, and a 40% lower risk of liver cancer. And since liver and colorectal are the cancers responsible for the 3rd and 4th most deaths in the world, this is rather impactful. Coffee also reduces your risk for skin cancer, particularly in women, by about 20%.
Depending on how you create it though, this beverage can either taste truly sublime or be downright undrinkable. More confounding is that if you're not careful the results can potentially vary wildly, even when you use the same coffee beans from an identical bag roasted within the same batch and at the same time. This is why consistency is important in each step.
Some health benefits of coffee come from the beverage's caffeine content and not necessarily from the coffee itself. For example, the review of studies published in Australian & New Zealand Journal of Psychiatry determined there was also a nonlinear association between caffeine and a lower risk of depression, in addition to the link with coffee itself. Caffeine, a stimulant, also has a beneficial effect on athletic performance, with research published in 2016 in the Journal of Sports Science determining that dosing with caffeine prior to physical activity increased "vigor" and decreased fatigue. To use this to your benefit before working out, drink a cup of black coffee about 30 to 45 minutes before you begin exercising.