Pear and Apple Salad with Gruyere and Toasted Pecans

Bahan-bahan (6 porsi)

• 2 tablespoons balsamic vinegar
• 1 tablespoon whole grain mustard
• kosher salt and freshly ground black pepper
• ¼ cup vegetable or canola oil
• 1 head Boston lettuce, (chopped)
• 6 ounces spinach leaves, (chopped)
• 2 medium ripe Anjou or Comice Pears
• 2 medium Granny Smith apples
• 2 tablespoons freshly squeezed lemon juice
• 2½ cups seedless grapes, (halved)
• 5 ounces Gruyere cheese, (chopped)
• ¾ cup pecan halves, (toasted (see NOTES BELOW))