I dont ever cube the tenderloin or the backstraps but to each his own.
Just follow the old southern routine. Pound em out with a cubing hammer and soak em in buttermilk overnight.
Tomorrow dredge them in some all purpose flour that has a good dose of black pepper and salt and fry them up in melted beef suet or vegetable oil.
Be sure and make white gravy and home made buttermilk biscuits too.
Dang I'm getting hungry
There will def be gravy and biscuits. The clock is ticking for their date with an iron skillet and some hot peanut oil.