Directions
- Prepare the mushrooms. Wipe the mushroom caps clean, remove the stems and scrape out the dark gills with a spoon if desired. Whisk the balsamic vinegar, olive oil, soy sauce, garlic, herbs and pepper, then brush over both sides of the mushrooms. Rest for 10 minutes.
- Make the spread. Blend or mash the cannellini beans, tahini, lemon juice, herbs, garlic and 1 tablespoon water until creamy. Add the remaining water as needed for a spreadable consistency.
- Grill. Heat a grill pan, outdoor grill or heavy skillet over medium-high heat. Cook the mushrooms for 4–6 minutes per side, pressing gently, until deeply browned and tender. Rest for 2 minutes, then slice into thick strips.
- Toast the bread. Toast the bread in the dry grill pan or toaster until crisp at the edges.
- Assemble. Spread the white bean mixture over all four bread slices. Layer two slices with arugula, portobello, roasted pepper and red onion. Close the sandwiches, press gently and cut in half.
