The ornamental design for a fondueset, as shown and described.
FIG. 1 is a perspective view of an example of a fondue set, in accordance with embodiments;
FIG. 2 is a left side view of the fondue set of FIG. 1;
FIG. 3 is a right view of the fondue set of FIG. 1; and,
FIG. 4 is a top view of the fondue set of FIG. 1.
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. The views not shown form no part of the claimed design.