In a large skillet over medium heat, melt the butter.
Add the flour and seasonings, whisking to avoid lumps.
Gradually whisk in the stock, and bring to a boil, allowing the gravy to thicken to your desired consistency.
To make ahead and freeze your gravy:
Remove the gravy from the heat and cool. Transfer to an airtight container.
Store in the refrigerator or freeze until needed.
For best results, thaw the gravy in the refrigerator prior to use. Reheat the gravy over low heat and whisk well.