Party Size Spanakopita Melt

Bahan-bahan (6 porsi)

• 12 -16 ounces fresh baby spinach
• 2 tablespoons extra virgin olive oil
• 1 small shallot, chopped
• 2 cloves garlic, finely chopped or grated
• 1/3 cup fresh basil, chopped ((or 1 tablespoon dried))
• 1/3 cup fresh dill, chopped ((or 1 tablespoon dried))
• 1/4 cup fresh oregano, chopped ((or 2 teaspoons dried))
• kosher salt and black pepper
• 1 pinch red pepper flakes
• zest of 1 lemon
• 3/4 cup crumbled feta cheese
• 1 loaf ciabatta bread, halved lengthwise
• 6 slices provolone cheese
• 1/2 cup shredded mozzarella
• 2 tablespoons salted butter
• 1 tablespoon raw sesame seeds ((optional))