Inspired by classic Mediterranean flavors, this vegetarian sandwich is packed with caramelized lemon slices, fresh herbs, tangy feta, and roasted red peppers. If you love spanakopita, this sandwich is right up your alley.
Heat olive oil in a nonstick skillet. Add the lemon slices and sear until dark golden brown. Transfer to a cutting board and finely chop.
Add the shallots, garlic, oregano, and caramelized lemon, and cook until fragrant.
Add spinach and water, and cook until spinach is almost wilted. Crumble feta cheese and toss until the feta is starting to melt. Season with kosher salt and black pepper.
Slice ciabatta bread in half and toast. Layer on mozzarella cheese, spinach feta mixture, roasted red peppers, and more mozzarella.
Melt 2 tablespoons unsalted butter in the skillet over medium-low heat. Add the sandwich. Cover and cook until the bread is golden brown and the cheese is melted.