Grilled whole portobello mushrooms are a good vegetarian substitute for hamburger, especially when topped with grilled red onions and cheddar cheese. Chipotle ketchup provides acidity and spice, but you may substitute mayonnaise, with maybe a teaspoon of chopped parsley or basil, if you prefer a milder sauce.
Makes 2 sandwiches
- 2 large portobello mushrooms, stemmed and wiped clean
- Two ½-inch-thick slices red onion
- 2 tablespoons olive oil
- Salt and ground black pepper to taste
- 2 round Italian rolls
- ¼ cup Chipotle Ketchup, recipe below
- 3 ounces cheddar cheese, thinly sliced
- Heat a panini or sandwich press.
- 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 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 onion.
- Cover the onion with cheese ; top the sandwiches with the top halves of the rolls.
- Put the sandwiches on the press, and cook until they are browned and crisp and the cheese is melted, 5 to 7 minutes.
- Carefully remove from the press and serve immediately.
- ¼ cup ketchup
- ½ teaspoon finely chopped canned chipotle chiles in adobo, plus 1 teaspoon of the sauce
- ¼ teaspoon ground cumin
- 1 tablespoon fresh lime juice
- Combine all the ingredients in a small saucepan and bring to a simmer over medium heat.
- Cook, stirring often, until the sauce thickens, 2 to 4 minutes.
- Remove from the heat and let cool to room temperature.
- This will keep, tightly covered, in the refrigerator up to 1 week.
