
Heat the grill to 400ºF. Slice the loaf of ciabatta bread in half, hotdog-style.
Brush about a tablespoon of olive oil onto each side of the bread. Place cut-side down on the grill. Grill for 3-5 minutes to toast the bread. Make sure to watch closely. Once browned, remove from heat immediately.
Place the bottom of the ciabatta bread onto a large cutting board or baking sheet to begin assembling the sandwiches. Spread 1/4 cup of pesto on top of the bread. Evenly spread out the provolone cheese on top of the pesto.
Use a fork to spoon about 5 ounces of red pepper slices on top of the cheese. Then, evenly distribute the turkey deli meat on top of the peppers and place 2 handfuls of spinach on top of the turkey.
Place the ciabatta top onto the sandwich. Use a serrated knife to carefully slice the large sandwich into 6 portions.