Which ingredient is present in the J.J. Gargantuan?

The ingredient that is present in the J.J. Gargantuan is oregano. This sub is known for its bold flavor profile, which is given a distinctive taste by the inclusion of various herbs, including oregano. Oregano enhances the overall taste of the sub by providing a savory, aromatic quality that complements the other ingredients.

In the context of the J.J. Gargantuan, the combination of meats, vegetables, and the specific flavorings is key to its identity. Oregano is commonly used in Mediterranean and Italian dishes, contributing to the authentic taste experience one expects when enjoying this particular sandwich.

While Dijon, avocado, and cucumber may be popular in other sandwiches or dishes, they do not feature in the traditional recipe of the J.J. Gargantuan, making oregano the most fitting choice for this question.