A cooker at least one shell egg (4), said apparatus comprising a device for providing microwave radiation in a confined space, also said space comprising a provided receptacle of at least one cavity adapted to the shape of the egg shell, said cavity of a first layer surrounding the shell being provided said first layer is: - contact heat exchange with the egg shell, - has a dielectric constant with an imaginary part ε at a temperature between 20-500 0 ° C-100 ° C and a frequency of microwave 2.45 GHz, and - has a thickness d of 6.1 mm layer thickness d and the layer varies less than 30% throughout the egg, wherein the receptacle comprises a layer (6) of material formed to have an inner surface which follows the contour of the shell (4) of the egg interior surface is at a distance from the shell (4) of the egg, giving the cavity (8) around the shell (4) of the egg, receptacle it is having at least two parts which when separated allow access to the cavity (8), to place the egg on the receptacle, and to close the receptacle around the egg, the receptacle comprising an opening (10) filling to fill the cavity (8) with a liquid having the properties of the prim It was layer.Un aparato para cocer al menos un huevo con cáscara (4), comprendiendo dicho aparato un dispositivo para proporcionar radiación de microondas en un espacio reducido, comprendiendo además dicho espacio un receptáculo dotado de al menos una cavidad adaptada a la forma del huevo con cáscara, estando dotada dicha cavidad de una primera capa que rodea a la cáscara dicha primera capa: - está en contacto de intercambio de calor con la cáscara del huevo, - tiene una constante dieléctrica con una parte imaginaria ε entre 20-500 a una temperatura de 0°C-100°C y a una frecuencia de microondas de 2,45 GHz, y - tiene un grosor d de capa de 1-6 milímetros y el grosor d de la capa varía menos del 30% en todo el huevo, en el que el receptáculo comprende una capa (6) de material conformada para tener una superficie in
