A food preparation system includes a food preparation machine with a receptacle for a food capsule and a fluid injecting member, and the food capsule including a capsule body, a cavity, a first end, an opening communicating with the cavity, a second end including at least one outlet communicating with the cavity, an injection wall, and at least one partition dividing the cavity into chambers containing a respective quantity of an alimentary substance and having at least one outlet with an independently-operable closure member in the second end. The injection means injects a quantity of fluid into the capsule through a single injection point, and a sealing member selectively blocks fluid communication between the chambers, resisting a pressure difference between the chambers of between 2 and 20 bar, preferably between 4 and 15 bar.