Ingredients

  • 3 tablespoons red-wine vinegar
  • 1 tablespoon Dijon mustard
  • Coarse salt and freshly ground pepper
  • 2/3 cup olive oil
  • 4 large portobello mushrooms (1 1/2 pounds), stems removed, caps cleaned
  • 3 heads endive, sliced crosswise 1/2 inch thick (about 4 cups)
  • 8 ounces mesclun or mixed salad greens (about 10 cups)
  • 1 small red onion, halved and thinly sliced
  • 4 ounces blue cheese, crumbled

Method

  • Preheat oven to 450F.
  • In a small bowl, whisk together vinegar, mustard, 1/4 teaspoon salt, and 1/4 teaspoon pepper.
  • Slowly add olive oil, whisking to emulsify.
  • Reserve 1/2 cup dressing to toss with the greens.
  • Place mushrooms on a baking sheet.
  • Coat both sides with some of the remaining dressing (see below).
  • Roast mushrooms, stem sides up, brushing with more dressing every 5 minutes, until they are tender, about 15 minutes.
  • Toss the endive, mesclun, onion, and blue cheese with reserved dressing, and divide among four salad bowls.
  • Slice mushrooms 1/2 inch thick, and arrange pieces over each serving.
  • Serve immediately.
  • A pastry brush is the best tool for coating the mushrooms with dressing, before and as they cook.