The ornamental design for a cookingsystem, as shown and described.
FIG. 1 is a front perspective view of the cooking system in accordance with the present invention;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a left side view thereof.
The broken line showing of the support legs, lid handles, griddle, sauce trays, control knobs, cleanout tray and power adapter are for illustration purposes and form no part of the claimed design.