Braised Lentils With Onions and Spinach

INGREDIENTS

• 1 tablespoon olive oil
• 1 cup carrot, peeled and finely chopped
• 1/2 cup shallots, peeled and finely chopped
• 1/4 cup dry white wine
• 2 cups dried lentils
• 4 cups thinly sliced onion
• 3 1/2 cups fat-free, less-sodium chicken or vegetable broth
• 1/4 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 2 thyme sprigs
• 2 tablespoons red wine vinegar
• 1 (10-ounce) bag prewashed spinach
• 1 (4-ounce) package crumbled feta cheese