Warm Pear & Spinach Salad with Maple-Bacon Vinaigrette

Combine spinach, pear and onion in a large bowl.

Cook bacon in a small skillet over medium heat until crisp, 5 to 7 minutes. Transfer to a plate with a slotted spoon. Add enough oil to the pan drippings to make 2 tablespoons total. Add vinegar, syrup, salt and pepper; bring to a simmer. Immediately pour the dressing over the salad and gently toss to coat. Serve sprinkled with the bacon and walnuts.