An apparatus (1) for manufacturing food tablets for hot beverage extraction, the apparatus (1) comprising: a reservoir (2) for supplying loose infusible food; Grinding means (3) for grinding loose food products to obtain a ground product having a predetermined particle size; Wetting means (9) for wetting the pulverized material to impart it with a predetermined moisture content; Mixing and homogenizing means (10) for mixing and homogenizing the wet pulverized material to obtain a homogeneous mixture; Weighing means (25) for weighing the wet and homogenized mixture to obtain a dose having a predetermined weight; Molding means (26) for forming a volume of the mixture into tablets having a predetermined volume; Irradiation means (27) for irradiating the tablet with an electromagnetic wave beam to impart relative compressibility and self-supporting ability and overheating to partially bake and/or sinter the particles of the wet and homogenized mixture without requiring an enclosure; and , In order to change the water permeability of the final tablet according to these parameters by controlling the particle size, moisture content, homogeneity, weight, volume and compression parameters of the tablet, the grinding means (3), the wetting means (9), a control means (51) acting on the mixing and homogenizing means (10), the metering means (25), the shaping means (26) and the irradiation means (27) is provided.