Finish the following sentence with the best choice: how to add flavor to bland broths and stocks?

Choices:
- freeze vegetable scraps, and add in a muslin bag when simmering stocks.
- add a few drops of liquid smoke, and a touch of oyster sauce and a few tablespoons of unflavored gelatin.

Answer:
freeze vegetable scraps, and add in a muslin bag when simmering stocks.