- 2 large portobello mushrooms, stemmed and wiped clean
- Two ½-inch-thick slices red onion
- 2 tablespoons olive oil
- Salt and freshly ground black pepper to taste
- 2 round Italian rolls
- ¼ cup Chipotle Ketchup
- 3 ounces cheddar cheese, thinly sliced
- Heat a panini or sandwich press according to the manufacturer’s instructions.
- Brush the mushrooms and onions with olive oil and sprinkle with salt and pepper. Place them on the press, pull the top down, and cook until softened and browned, 4 to 6 minutes. Transfer to a plate and let cool slightly.
- Cut the rolls in half with a sharp serrated knife. Spread some chipotle ketchup on the bottom half of each roll. Place a mushroom on each bottom half. Top with a slice of grilled onion. Cover the onion with cheese. Top the sandwiches with the top halves of the rolls.
- Put the sandwiches on the press, pull the top down, and cook until they are browned and crisp and the cheese is melted, 5 to 7 minutes, depending on how hot your machine is. Carefully remove from the press and serve immediately.