The ornamental design for a barbecue apparatus, as shown and described.
FIG. 1 is a top plan view of a barbecue apparatus;
FIG. 2 is a right elevational view thereof;
FIG. 3 is a bottom elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 a left elevational view thereof;
FIG. 6 a rear elevational view thereof; and,
FIG. 7 is an isometric view thereof, showing my design.
The broken lines are for environmental purposes only and form no part of the claimed design. The design shown is not to be limited to any particular size and may be scaled larger or smaller.