Ingredients:5 tablespoons olive oil3 tablespoons balsamic vinegar2 teaspoons minced fresh tarragon2 garlic cloves, minced2 tablespoons maple syrup, divided1 (1-pound) pork tenderloin, trimmed1/2 teaspoon kosher salt1/4 teaspoon freshly ground black peppercooking spray2 large nectarines, halved and pitted6 cups gourmet salad greens1/2 cup thinly sliced red onion