Ingredients
Method
- Pulse pistachios, basil, Parmesan, and garlic finely in a small food processor. Add oil, lemon juice, and pepper; pulse just until thick, slightly textured pesto forms.
- Spread drained ricotta evenly on bottom focaccia halves; spread pesto on top cut faces.
- Loosely fold mortadella over ricotta, dividing evenly. Add dry arugula without packing tightly.
- Close with pesto tops; cut across middle. Serve cold or promptly refrigerate at 40°F or below; transport with ice packs.