2 quarts low-sodium chicken broth or vegetable broth, or 1 cup dried mushrooms (preferably porcini) and 2 quarts water
1/4 cup olive oil, plus more for drizzling
1 medium yellow onion, finely chopped
Kosher salt
Freshly ground black pepper
2 cups Arborio or Carnaroli rice
1 cup dry white wine
1 1/4 cups finely chopped fresh herbs, such as Italian parsley, tarragon, basil, chives, or chervil
1/4 cup finely grated Parmesan cheese, plus more as needed
1 1/2 teaspoons freshly squeezed lemon juice, plus more as needed