There are two ways to make double brewed coffee. In most cases, this drink is made by doubling the amount of coffee grounds that would otherwise be used. People who wish to make this type of coffee drink will need to measure the coffee and water, heat the water to the desired temperature and then allow the coffee and water to combine. The other method for making double brewed coffee is not preferred by most people who drink it. This method involves running coffee through a coffee machine a second time and creates a coffee drink that tastes highly acidic.
One of the best tips for making double brewed coffee is to start out with high quality ingredients. The quality of coffee, in particular, can vary considerably and greatly affects the flavor of the double-brewed drink. In general, coffee drupes from plants of the arabica species are harvested, dried and roasted in order to make coffee beans. The best coffees follow good practices that start with harvesting only drupes that are fully ripe and continue through roasting the beans at the proper temperature, preferably no more than a month or so before they are going to be used. The quality of the water that goes into double brewed coffee will also affect the taste of the coffee and many people chose to use distilled water for its cleaner flavor.
Using the correct ratio of coffee grounds to water is also important when making double brewed coffee. The recipe usually asks for about 4 tablespoons (60 milliliters) of ground coffee per 8 ounces (0.24 liters) of water, though the exact ratio will differ depending on how coarsely the coffee is ground and the drinker's individual taste. Though many people use only about a tablespoon (15 milliliters) of coffee in a normal cup of coffee, using 2 tablespoons (30 milliliters) of coffee per 8 ounces of water will make strong coffee but not double brewed coffee. More coffee grounds are needed to make coffee that is truly be considered double brewed.
The alternative method for making double brewed coffee, brewing it twice, must be done carefully. Filling the water reservoir in a drip coffee machine with brewed coffee can damage the machine and is not recommended. It is possible, however, to brew coffee and then place it in a French press or a double boiler filled with extra coffee grounds. In any case, this type of coffee will often taste burned and acidic.