The ornamental design for a soupserver, as shown and described.
FIG. 1 is a top, right front perspective view of a soup server showing our new design;
FIG. 2 is a fragmentary perspective view taken in the direction of arrow 2 in FIG. 1;
FIG. 3 is a right side elevational view of FIG. 1;
FIG. 4 is a front elevational view of FIG. 1;
FIG. 5 is a rear elevational view of FIG. 1;
FIG. 6 is a top plan view of FIG. 1; and,
FIG. 7 is a bottom plan view of FIG. 1.
The broken line showing of structural elements is included for the purpose of illustrating portions of the soup server that form no part of the claimed design.