If you're my mom or grandma, you use the crisco tub in the fridge full of used bacon grease, cooking oil, butter, margarine, and yes, even some crisco, and you make it with that.

I didn't know what I was fed for my entire childhood was nominally a "white" gravy until well into adulthood.

It was pretty good though, NGL.

White sauce? The one you pour over asparagus?

And they eat that in the morning müsli? 🤢

That's the fancy way. I make mine with cornstarch.