The present invention concerns a food preparation system producing a food product, comprising a food preparation machine (500) with a receptacle (501) for a food capsule (300) and fluid injecting means (503), and a food capsule (300) comprising a capsule body (301), a cavity (302), a first end (303), an opening (305) communicating with said cavity (302), a second end (304) comprising at least one outlet (310, 311) communicating with said cavity (302), an injection wall (314), and at least one partition (306) dividing said cavity (302) into chambers (308, 309) containing a respective quantity of an alimentary substance (315, 316) and having at least one outlet (310, 311) with an independently-operable closure means (312, 313) in said second end (304), characterized in that the injection means (503) injects a quantity of fluid (508, 512) into said capsule (300) through a single injection point (504), and a sealing means (507A) selectively blocks fluid communication between said chambers (308, 309), resisting a pressure difference between said chambers (308, 309) of between 2 and 20 bar, preferably between 4 and 15 bar.
