The ornamental design for a barbecue, as shown and described.
FIG. 1 is a perspective view showing the top and front of the barbecue showing my new design shown attached to a frame, which is shown in broken lines and forms no part of the claimed design.
FIG. 2 is a perspective view showing the top and rear of the Barbecue showing my new design shown attached to a frame, which is shown in broken lines and forms no part of the claimed design.
FIG. 3 is a perspective view showing the bottom of the barbecue showing my new design.
FIG. 4 is a top view of the barbecue showing my new design.
FIG. 5 is a left side view of the barbecue showing my new design shown attached to a frame, which is shown in broken lines and forms no part of the claimed design.
FIG. 6 is a right side view of the barbecue showing my new design shown attached to a frame, which is shown in broken lines and forms no part of the claimed design.
FIG. 7 is a front view of the barbecue showing my new design shown attached to a frame, which is shown in broken lines and forms no part of the claimed design; and,
FIG. 8 is a rear view of the barbecue showing my new design shown attached to a frame, which is shown in broken lines and forms no part of the claimed design.