The ornamental design for a “joint cooking appliance,” as shown and described.
FIG. 1 is a perspective view of my new design for a “joint cooking appliance” illustrating surfaces thereof that is adapted for embedding into a joint during roasting;
FIG. 2 is a front elevation view of the article shown in FIG. 1;
FIG. 3 is a right side elevation view of the article shown in FIG. 1;
FIG. 4 is a rear elevation view of the article shown in FIG. 1;
FIG. 5 is an upper elevation view of the article shown in FIGS. 1 and 4; and,
FIG. 6 is a lower elevation view of the article shown in FIGS. 1 and 4.