1. 1. Add fresh mushrooms, cucumber, olives, feta cheese, balsamic vinegar, dried oregano, tomatoes, and minced garlic to medium bowl.
2. 2. Slice sub sandwich rolls horizontally.
3. 3. Place lettuce on sandwich bottom. Layer ham and turkey over lettuce.
4. 4. Top turkey bottoms with vegetable mixture using slotted spoons.
5. 5. Cover with sandwich roll tops.