This recipe crafts a sophisticated vegetarian sandwich featuring grilled asparagus and red onion, complemented by a vibrant, smoky roasted red bell pepper spread. A creamy, savory dressing made with mayonnaise, grainy mustard, red miso, and lemon juice binds the fresh ingredients, creating a flavorful and satisfying meal.
For the bell pepper, charring it directly over a gas flame or under a broiler will give it a deeper smoky flavor and make peeling easier. The red miso is a key umami component; ensure it's well-dissolved in the mayonnaise mixture for an even flavor. When grilling the asparagus and onion, avoid overcrowding the pan to ensure they char and caramelize properly, rather than steam. A light toast on the peasant bread will add texture and prevent it from becoming soggy, but avoid over-toasting as the vegetables and spread already provide plenty of flavor.