The ornamental design for salad serveware, as shown and described.
FIG. 1 is a front, perspective view of salad serveware showing our new design;
FIG. 2 is a front view thereof, the rear view being a mirror image of the front view;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The dash-dash broken lines represent environment and form no part of the claim. The long dash-short, dash lines represent a boundary of the claim and form no part of the claim.