The ornamental design for food tray, as shown and described.
FIG. 1 is a top perspective view of a food tray showing my new design, and
FIG. 2 is a top plan view thereof;
The end of the tray opposite that shown in FIG. 1 is an exact mirror image
of the end shown. The bottom of the tray is a smooth planar surface curved
at the front and rear edges to match the curvature of the ends.