Name a savory item that often includes olives at Porto's.

The Mediterranean Sandwich is a savory item that prominently features olives among its ingredients. This sandwich typically includes a combination of flavors that evoke Mediterranean cuisine, such as feta cheese, fresh vegetables, and zesty spreads, with olives adding a briny richness that enhances the overall taste. The inclusion of olives is characteristic of many Mediterranean-inspired dishes, making this option the most fitting choice to represent a savory item with olives at Porto's.

In contrast, while the Cuban Sandwich, Chicken Salad Sandwich, and Meatball Sub may be flavorful in their own right, they do not commonly include olives as a key ingredient in their traditional recipes, which is why they do not match the criteria of the question as closely as the Mediterranean Sandwich.