This Mortadella Pesto Melt is a party-sized sandwich featuring homemade sunflower seed pesto, high-quality mortadella, roasted wild mushrooms, melty provolone, and pecorino topped with arugula, Calabrian chilis, olives, red onion, and cucumbers.
Place the garlic in a large food processor. Add the sunflower seeds, basil leaves, and kosher salt. Blitz until a paste begins to form.
With the food processor running, stream in the olive oil and the lemon juice. Blitz until smooth. Transfer the pesto to a bowl and fold in the shredded pecorino. Transfer the pesto to the fridge and chill until you’re ready to start building your sandwich. The pesto can be made well in advance and leftovers keep for 1 week sealed in the fridge.
For the Melt
Preheat the oven to 400°F.
Line a small baking sheet with parchment paper and set it aside. Place the mushrooms in a large bowl and add the olive oil. Sprinkle the mushrooms with the salt and add the crushed red pepper flakes, toss to coat. Pour the dressed mushrooms onto the baking sheet and set them aside.
Line a larger baking sheet with parchment paper and set it aside as well. Arrange the bread on the large baking sheet cut-side-up. Place 2 heaping tablespoons of the pesto on each half. Using a knife or an offset spatula, spread the pesto across both halves to ensure the pesto is evenly distributed.
Place the bread and the mushrooms in the oven and bake for 10 minutes. When the 10 minutes are up take the mushrooms and bread out of the oven. Set the mushrooms aside and take the top half of the loaf off of its baking sheet and set it aside as well.
Place the mortadella slices on top of the bottom half of the bread. Top the mortadella with the provolone and place the mushrooms on top. Finish with a healthy sprinkling of pecorino. Return the bottom half of the bread to the oven and bake for 10 minutes or until the cheese is melted.
When the 10 minutes are up, take the bread out of the oven and top with the baby arugula. Topped the arugula with Calabrian chilis, followed by a mix of pitted olives, red onions, and finally cucumber. Finish the sandwich off with fresh ground pepper and placed the top half, well, on top.
Transfer the sandwich to a large cutting board and secure with 4 or 5 cocktail skewers. You can either slice and serve or serve whole and slice into it with an audience.