The design is the features of shape and ornament of the food container as shown in solid lines in the drawings. The top seal shown in stippled lines in Figure 1 is environment and does not form part of the design.Drawings of the design are included wherein:Figure 1 is an upper perspective view of a food container showing the design with a top seal shown as environment;Figure 2 is an additional upper perspective view of the food container of Figure 1;Figure 3 is a lower perspective view of the food container of Figures 1 and 2;Figure 4 is a top plan view of the food container;Figure 5 is a bottom plan view of the food container;Figure 6 is a front side elevational view of the food container;Figure 7 is a rear side elevational view of the food container; andFigure 8 is a right side elevational view the food container, with the left side being a mirror image thereof.