A beverage preparation device comprising: a reservoir and a handle enabling a user to hold the reservoir; a cooking volume surrounded and defined by a lateral wall of the reservoir and suitable for introducing therein a liquid mixture intended to form the beverage to be prepared; a heating assembly for heating the reservoir and the liquid mixture, when in use; an control circuit for controlling the heating assembly; and at least one sensor for use in temperature control, the sensor being associated with the control circuit, characterized in that said beverage preparation device further comprises: at least one sensor formed as a conductive pin contactable with the liquid mixture, said sensor disposed in the reservoir; a ground connection area, a ground line of which is connected to the heating assembly for safety purposes, and which is in communication with the control circuit, or a conductive element positioned in such manner that it is in contact with the liquid mixture in the reservoir, when in use, and which is in communication with the control circuit; the control circuit capable of measuring a change in resistance of the liquid mixture by means of at least one sensor through the ground connection area, with which it is in communication in order to measure a change in the temperature of the liquid mixture, or through the conductive element and in that said control circuit is configured such that it, in use, calculates a corresponding temperature value via a predefined algorithm according to the measured resistance value of the liquid mixture, and cuts-off power supplied to the heating assembly or shuts it off, partially, when the desired temperature value is reached. a cooking volume surrounded and defined by a lateral wall of the reservoir and suitable for introducing therein a liquid mixture intended to form the beverage to be prepared; a heating assembly for heating the reservoir and the liquid mixture, when in use; an control circuit for controlling the heating assembly; and at least one sensor for use in temperature control, the sensor being associated with the control circuit, characterized in that said beverage preparation device further comprises: at least one sensor formed as a conductive pin contactable with the liquid mixture, said sensor disposed in the reservoir; a ground connection area, a ground line of which is connected to the heating assembly for safety purposes, and which is in communication with the control circuit, or a conductive element positioned in such manner that it is in contact with the liquid mixture in the reservoir, when in use, and which is in communication with the control circuit; the control circuit capable of measuring a change in resistance of the liquid mixture by means of at least one sensor through the ground connection area, with which it is in communication in order to measure a change in the temperature of the liquid mixture, or through the conductive element and in that said control circuit is configured such that it, in use, calculates a corresponding temperature value via a predefined algorithm according to the measured resistance value of the liquid mixture, and cuts-off power supplied to the heating assembly or shuts it off, partially, when the desired temperature value is reached. at least one sensor formed as a conductive pin contactable with the liquid mixture, said sensor disposed in the reservoir; a ground connection area, a ground line of which is connected to the heating assembly for safety purposes, and which is in communication with the control circuit, or a conductive element positioned in such manner that it is in contact with the liquid mixture in the reservoir, when in use, and which is in communication with the control circuit; the control circuit capable of measuring a change in resistance of the liquid mixture by means of at least one sensor through the ground connection area, with which it is in communication in order to measure a change in the temperature of the liquid mixture, or through the conductive element and in that said control circuit is configured such that it, in use, calculates a corresponding temperature value via a predefined algorithm according to the measured resistance value of the liquid mixture, and cuts-off power supplied to the heating assembly or shuts it off, partially, when the desired temperature value is reached.