Roasted Tenderloin and Portobello Sandwich

Name: Roasted Tenderloin and Portobello Sandwich
Ingredients: 4 small portobello mushrooms, stems removed; Salt; Freshly ground black pepper; 2 cups port; 1/2 pound beef tenderloin; 2 tablespoons olive oil; 1/2 cup Garlic Aioli, recipe follows; 4 large onion rolls, split in half; 4 thin slices of Fontina; 1 cup baby arugula, washed and patted dry; Drizzle extra-virgin olive oil; 1 1/2 pounds fried sweet potato chips; 3 garlic cloves, chopped; 1 large egg*; 1 tablespoon freshly squeezed lemon juice; 1 tablespoon chopped fresh parsley; 1/2 teaspoon salt; 1/2 teaspoon freshly ground black pepper; 1/2 cup olive oil