The ornamental design for a foodwastedigesterunit, as shown and described.
FIG. 1 is a front perspective view of a food waste digester unit showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right-side elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the drawings are for the purpose of illustrating portions of the food waste digester unit, which form no part of the claimed design.