Abstract: Methods and apparatus utilizing a high pressure food package involving filling a cup with a quantity of food product chosen so as to be capable of absorbing sufficient CO2 to produce effervescence easily detectable by a person later removing and consuming the food product, introducing CO2 into the cup, closing the lid, pressurizing the interior space with CO2 and generating sufficient effervescence in the food product, applying an anti-tamper feature to the closed cup, allowing the internal pressure of CO2 to increase and stabilize, transporting and holding the package for retail sale, providing means for a consumer to depressurize the package before removing the lid, and providing means for a consumer to hold the cup in one hand and twist off the lid with another hand, and to use fingers of one hand to remove the carbonated food product from the cup.

Abstract: A high pressure food package and system including a cup for holding a quantity of food product, a lid for covering the cup, and at least one one-way sealing mechanism that permits a gas to pass through the sealing mechanism into the interior space enclosed by the cup and lid and that prevents the gas from escaping from the interior space through the sealing mechanism. The high pressure package (and system and method for using the same) is especially well suited for producing a food product (such as fruits or vegetables) having an effervescent sensory (or carbonated) character.

Abstract: A high pressure food package and system including a cup for holding a quantity of food product, a lid for covering the cup, and at least one one-way sealing mechanism that permits a gas to pass through the sealing mechanism into the interior space enclosed by the cup and lid and that prevents the gas from escaping from the interior space through the sealing mechanism. The high pressure package (and system and method for using the same) is especially well suited for producing a food product (such as fruits or vegetables) having an effervescent sensory (or carbonated) character.

Abstract: A carbonation vessel comprising a container for holding a quantity of fruits or vegetables, an insert pan separating a lower space within the container from an upper space and having a gas vent for allowing gas to flow from the upper space to the lower space, a lid covering the upper space and a top opening of the container, a sealing member positionable between the lid and the top opening of the container, and at least one clamp for clamping the lid to the top opening of the container with the sealing member therebetween, thereby sealing the vessel. In one embodiment, the vessel can retain at least thirty pounds per square inch internal pressure. The internal pressure may comprise gaseous carbon dioxide generated in the upper space of the vessel by mixing sodium bicarbonate and citric acid with water, allowing sublimation of dry ice within the upper space, or other carbon dioxide gas generating means.