A mixing device and method for mixing at least one first ingredient and at least one second ingredient. The device includes a body which has a wall defining a cavity. A first inlet communicates with the cavity for introducing the first ingredient and a second inlet communicates with the cavity for introducing the second ingredient. An outlet is provided in communication with the cavity receiving the mixed first and second ingredient which have been mixed in the cavity. The ingredients are mixed by introducing one ingredient as a stream and the second ingredient as a forcefully introduced stream. An area upstream of the ingredients is provided for mixing ingredients. Once mixed the ingredients must flow through the body before reaching the outlet. The device can be in the form of a kit for retrofitting on existing devices such as beverage dispensers.