I claim the ornamental design for a portable food turntable, as shown and described.
FIG. 1 is a perspective view of a portable food turntable showing the new design thereof.
FIG. 2 is a top elevational view thereof.
FIG. 3 is a front side elevational view thereof.
The back side elevational view is the exact same as the front side elevational view.
The right side elevational view is the exact same as the front side elevational view,
The left side elevational view is the exact same as the right side elevational view; and,
FIG. 4 is a bottom side elevational view thereof.
The broken lines for the portable food turntable throughout FIGS. 1 through 4 are for illustrative purposes only and form no part of the claimed design.