A food preparation system configured to produce a food product, comprising: (i) a food preparation machine (500, 500A) provided with a receptacle for a food capsule (300, 700) and an injection means (503, 711) for injecting a pressurized fluid (508, 510, 712, 716) therein; and (ii) A food capsule (300, 700) enclosing a cavity (302, 700B) and having a first end (303, 700C) comprising an opening (305, 700E) communicating with said cavity (302, 700B), a second end (304, 700D) comprising at least one outlet (310, 311, 702) communicating with said cavity (302, 700B), an injection wall (314, 709) closing said first end (303, 700C), and at least one partition (306, 708) disposed within said cavity (302, 700B) dividing said cavity (302, 700B) into a plurality of chambers (308, 309, 706, 710), each containing a quantity of an alimentary substance (315, 316, 713, 717), characterized in that said food preparation machine (500, 500A) comprises a single injection means (503, 711) configured to inject a quantity of fluid (508, 512, 712, 716) into one first chamber (308, 710) of said capsule (300, 700) through a single injection point (504, 711A), and further comprises a sealing means configured to selectively block fluid communication between at least two of said chambers (308, 309, 706, 710) during the injection of a quantity of fluid (508, 512, 712, 716) in said first chamber (308, 710), said sealing means capable of resisting a pressure difference between said chambers (308, 309, 706, 710) of between 2 and 20 bar, preferably between 4 and 15 bar, and said sealing means comprising a sealing edge of the partition and a pressing means (507, 507A) disposed within the food preparation machine, configured to press together said sealing edge and the injection wall of said capsule. (i) a food preparation machine (500, 500A) provided with a receptacle for a food capsule (300, 700) and an injection means (503, 711) for injecting a pressurized fluid (508, 510, 712, 716) therein; and (ii) A food capsule (300, 700) enclosing a cavity (302, 700B) and having a first end (303, 700C) comprising an opening (305, 700E) communicating with said cavity (302, 700B), a second end (304, 700D) comprising at least one outlet (310, 311, 702) communicating with said cavity (302, 700B), an injection wall (314, 709) closing said first end (303, 700C), and at least one partition (306, 708) disposed within said cavity (302, 700B) dividing said cavity (302, 700B) into a plurality of chambers (308, 309, 706, 710), each containing a quantity of an alimentary substance (315, 316, 713, 717), characterized in that said food preparation machine (500, 500A) comprises a single injection means (503, 711) configured to inject a quantity of fluid (508, 512, 712, 716) into one first chamber (308, 710) of said capsule (300, 700) through a single injection point (504, 711A), and further comprises a sealing means configured to selectively block fluid communication between at least two of said chambers (308, 309, 706, 710) during the injection of a quantity of fluid (508, 512, 712, 716) in said first chamber (308, 710), said sealing means capable of resisting a pressure difference between said chambers (308, 309, 706, 710) of between 2 and 20 bar, preferably between 4 and 15 bar, and said sealing means comprising a sealing edge of the partition and a pressing means (507, 507A) disposed within the food preparation machine, configured to press together said sealing edge and the injection wall of said capsule.