Brewing receptacle and a foam unit and a beverage maker comprising such a brewing receptacle

A brewing receptacle for an apparatus for brewing a beverage such as coffee. The receptacle has a brewing chamber ( 13; 63; 113 ) having an entry passage and an exit passage for displacing water through the chamber ( 13; 63; 113 ) for brewing the beverage, a bottom ( 14; 64; 114 ) for supporting the particles ( 18; 118, 118' ) ( 18 ), and a discharge 5 opening ( 19; 69; 119 ) in the bottom ( 14; 64; 114 ) for discharging beverage liquid through the bottom ( 14; 64; 114 ). At least the bottom ( 14; 64; 114 ) is invertible between a first and a second operative position. The brewing chamber ( 13; 63; 113 ) has a first volume and a first shape when the bottom ( 14; 64; 114 ) is in said first position and at least a second volume or a second shape of the brewing chamber in said second position is different from the first volume or shape, respectively.