Controlled positioning in food processor

A machine (1) for processing a liquid food substance includes: a jug (20) having a container (21) and delimiting a food cavity (21′) for containing the liquid food substance; and a base (10) that has one or more walls (11) forming a seat (11′) for removably receiving the container (21). The base (10) and the jug (20) comprise or delimit, respectively, an off-centred projecting member (33) and a corresponding off-centred seat (13) for the projecting member (33) or vice versa. The off-centred seat (13) is configured to receive the projecting member (33) when the container (21) is received by the base seat (11′) such that the container (21) is in place for processing the liquid food substance. The off-centred projecting member (33) is configured to maintain the container (21) off its place for processing the liquid food substance in the cavity (21′) when the projecting member (33) is off-set relative to the off-centred seat (13).