Mixing and blending apparatus for food preparations, which comprises: - a bowl provided with an open bottom, - a blade-holder configured to be engaged in the bottom of the bowl, the blade-holder comprising blades rotatably mounted and first coupling means subservient to the blades, - a locking ring configured to be positioned on the bottom of the bowl and to keep the blade-holder engaged in said bottom, a first assembly system (25, 27) being arranged between the bowl and the locking ring, the first assembly system (25, 27) between the bowl and the locking ring setting in place a rotation of the bowl with respect to the locking ring, or vice versa, - a base comprising rotation means of second coupling means complementary to the first coupling means and a receiving area configured to receive a pre-mounted assembly consisting of the bowl, the blade-holder and the locking ring by coupling the first coupling means and the second coupling means and by housing the locking ring in the receiving area, - a stop system (12, 36) arranged between the receiving area and the locking ring for locking the locking ring in the assembled position on the bowl, the stop system (12, 36) being set in place when the pre-mounted assembly is mounted on the base, characterised in that the apparatus comprises a second assembly system (10, 11, 32, 33) arranged between the bowl and the base, said second assembly system (10, 11, 32, 33) between the bowl and the base setting in place a rotation of the bowl with respect to the base, or vice-versa, the second assembly system (10, 11, 32, 33) being set in place during the mounting of the pre-mounted assembly on the base, and in that the stop system (12, 36) is configured to complete, if necessary, the setting in place of the first assembly system (25, 27) between the locking ring and the bowl by rotation of the bowl with respect to the locking ring, or vice-versa, during the setting in place of the second assembly system (10, 11, 32, 33) between the bowl and the base by rotation of the bowl with respect to the base, or vice-versa. - a bowl provided with an open bottom, - a blade-holder configured to be engaged in the bottom of the bowl, the blade-holder comprising blades rotatably mounted and first coupling means subservient to the blades, - a locking ring configured to be positioned on the bottom of the bowl and to keep the blade-holder engaged in said bottom, a first assembly system (25, 27) being arranged between the bowl and the locking ring, the first assembly system (25, 27) between the bowl and the locking ring setting in place a rotation of the bowl with respect to the locking ring, or vice versa, - a base comprising rotation means of second coupling means complementary to the first coupling means and a receiving area configured to receive a pre-mounted assembly consisting of the bowl, the blade-holder and the locking ring by coupling the first coupling means and the second coupling means and by housing the locking ring in the receiving area, - a stop system (12, 36) arranged between the receiving area and the locking ring for locking the locking ring in the assembled position on the bowl, the stop system (12, 36) being set in place when the pre-mounted assembly is mounted on the base, characterised in that the apparatus comprises a second assembly system (10, 11, 32, 33) arranged between the bowl and the base, said second assembly system (10, 11, 32, 33) between the bowl and the base setting in place a rotation of the bowl with respect to the base, or vice-versa, the second assembly system (10, 11, 32, 33) being set in place during the mounting of the pre-mounted assembly on the base, and in that the stop system (12, 36) is configured to complete, if necessary, the setting in place of the first assembly system (25, 27) between the locking ring and the bowl by rotation of the bowl with respect to the locking ring, or vice-versa, during the setting in place of the second assembly system (10, 11, 32, 33) between the bowl and the base by rotation of the bowl with respect to the base, or vice-versa.