Line a baking sheet with parchment. When bread is fully thawed, but still cool, lightly flour your work surface and roll loaf into a 12 x 4 inch rectangle. Starting on one of the long sides, tightly roll the rectangle up into a loaf, tucking the ends in as you work. Once rolled, pinch to seal seams and transfer loaf to parchment lined baking sheet. Lightly cover with a clean kitchen towel and let rise until doubled in size (about 1 hour). Lightly spritz loaf with water and cut 3 + diagonal slashes into your loaf with a sharp knife.
To make the herbed oil and vinegar dipping sauce, in a shallow plate combine oil and vinegar. Sprinkle garlic (or garlic powder), oregano, parmesan cheese, and black pepper evenly over oil and vinegar.
Bake loaf in a oven preheated to 500 for 15 to 18 minutes. Slice bread and serve with dipping sauce.