melt bacon grease and butter in a sauce pan over medium heat.
add flour and mix creating a roux.
whisk in milk slowly to prevent lumps.
whisk untill smooth and thick.
add bullion cube and salt and pepper.
TIPS- If your sauce gets to thick add more milk. If it is to runny, add more flour. You can serve this sauce over potatoes, biscuits, chicken fried steak, etc.