The ornamental design for a barbequegrillkettle, as shown and described.
FIG. 1 is a front-left-top perspective view of a barbeque grill kettle,
showing my new design, the legs and support brace are shown in broken
lines for illustrative purposes only and form no part of the claimed
design;
FIG. 2 is a front elevational view thereof (the rear elevational view being
a mirror image thereof);
FIG. 3 is a left side elevational view thereof (the right side elevational
view being a mirror image thereof);