Device for heating foods provided in a package (2, 3), which package comprises: - a shell-type or tray-type first package part for arranging foods; - a second package part, which encloses the first package part such that the upper side, the lower side, and a first and a second opposing circumferential side of the first package part are substantially covered by the second package part and at least a third or fourth circumferential side (6b, 6d) of the first package part is exposed, wherein a form fit exists between the first package part and the second package part; - a third circumferential side of the first package part, which connects the first and the second circumferential sides (6a, 6c) to one another and is not covered by the second package part; - a first lateral space, which extends at least partially along the first circumferential side, and which is formed between the first circumferential side of the first package part and the second package part; - a second lateral space, which extends at least partially along the second circumferential side, and which is formed between the second circumferential side and the second package part; wherein the device comprises: a) a housing; b) a heating chamber for heating foods, which is arranged inside the housing; c) transportation means comprising two transportation arms (9a, 9b) spaced apart from one another; and d) holding means, characterized in that the holding means comprise two holding arms (8a, 8b), which are spaced apart from one another and which extend at a substantially identical height in a substantially horizontal direction from an operating side of the housing such that a package (2, 3) can be plugged with the third circumferential side of the first package part in front onto the holding arms (8a, 8b) and thus defines a plugging-on direction, wherein the holding arms (8a, 8b) are each pushed into one of the two lateral spaces (11a; 11b) of the package, and can then be held by these two holding arms (8a, 8b) on the device, and wherein the transportation arms (9a, 9b), which, after the package (2, 3) is plugged onto the holding arms (8a, 8b) and with package (2, 3) held using the holding arms (8a, 8b) on the device, are each pushed into or can be pushed into the region between the holding arms (8a, 8b) into one of the two lateral spaces (11a, 11b), and using which, after the form fit is canceled between the first and the second package part, the first package part having the foods arranged thereon can be grasped and moved out of the second package part in the plugging-on direction of the package on the holding arms (8a, 8b) and transported into the heating chamber, wherein the second package part remains held using the holding arms (8a, 8b) on the operating side of the device, and after heating of the foods arranged thereon in the heating chamber, can be returned again completely into the second package part held using the holding arms (8a, 8b) on the operating side. - a shell-type or tray-type first package part for arranging foods; - a second package part, which encloses the first package part such that the upper side, the lower side, and a first and a second opposing circumferential side of the first package part are substantially covered by the second package part and at least a third or fourth circumferential side (6b, 6d) of the first package part is exposed, wherein a form fit exists between the first package part and the second package part; - a third circumferential side of the first package part, which connects the first and the second circumferential sides (6a, 6c) to one another and is not covered by the second package part; - a first lateral space, which extends at least partially along the first circumferential side, and which is formed between the first circumferential side of the first package part and the second package part; - a second lateral space, which extends at least partially along the second circumferential side, and which is formed between the second circumferential side and the second package part; a) a housing; b) a heating chamber for heating foods, which is arranged inside the housing; c) transportation means comprising two transportation arms (9a, 9b) spaced apart from one another; and d) holding means,