The ornamental design for vegetable fermenting kitchenware, as shown and described.
FIG. 1 is a front view of vegetable fermenting kitchenware showing my new design;
FIG. 2 is a back view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top back right perspective view thereof;
FIG. 5 is a top front right perspective view thereof; and,
FIG. 6 is a top perspective view thereof.
That which is depicted in solid lines in the drawings represents the claimed design. A Mason jar, depicted in broken lines in FIGS. 1-6, forms no part of the claimed design.