5 cups low-sodium vegetable or chicken broth
2 tablespoons olive oil
1 large yellow onion, finely chopped
1 large clove garlic, finely chopped
1 1/2 cups barley
1 cup dry white wine (such as Sauvignon Blanc)
1 pound asparagus, cut diagonally into 1-inch pieces
1/2 teaspoon kosher salt
1/4 teaspoon black pepper
1/2 cup (2 ounces) grated Parmesan