Preheat the oven to 400° F. Heat the olive oil in a large skillet over medium heat. Add the shallot and garlic and cook for 3-4 minutes, until the shallot is softened and fragrant. Stir in the spinach, basil, dill, oregano, and a pinch each of salt, pepper, and red pepper flakes. Cook another 5-8 minutes, until the spinach is wilted. Remove from the heat and stir in the lemon zest and feta cheese. Lay the bottom piece of ciabatta bread cut side facing up on a baking sheet. Layer the spinach on top. Add the provolone and mozzarella. Grab the top piece of bread and pull out some of the insides to create a little more space. Place the bread over all the cheese. Rub the top of the bread with butter, then sprinkle on the sesame seeds. Wrap the sandwich in foil. Bake 20 minutes, until the cheese melts. Remove the foil and return to the oven and bake another 10-15 minutes more, until the bread is toasted. Remove from the oven and let sit for 3-4 minutes. Slice into 4-6 larger or 8 smaller sandwiches. Serve with a drizzle of honey and chili flakes. Enjoy!