The ornamental design for food container, as shown and described.
FIG. 1 is a perspective view of a food container showing our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a rear end elevational view thereof;
FIG. 6 is right side elevational view thereof;
FIG. 7 is a front end elevational view thereof; and,
FIG. 8 is a left side elevational view thereof.
The broken lines shown represent unclaimed subject matter and form no part of the claim. Where broken lines abut a claimed surface it is understood that those broken lines represent an unclaimed boundary between claimed and unclaimed surfaces. None of the broken lines form any part of the claimed design.