A great trick for tenderizing frozen meat is adding a splash of mild vinegar to the bag. Vinegar is acidic, and acids are capable of denaturing proteins.
This Is the One Thing You Should Always Do Before Freezing Meat
How to Freeze and Reheat Meat Correctly
Probably a dumb question but If I froze this roast the day after it's freeze by date and it's been frozen for about a week is is okay to eat now or
How long can you freeze meat? Best practices and guidelines
Probably a dumb question but If I froze this roast the day after it's freeze by date and it's been frozen for about a week is is okay to eat now or
Important Tips On How To Freeze Steak To Retain Their Freshness For Longer
SPAR - Tenderise tough meat in seconds
Velveting beef - a simple process to tenderise beef - Nicky's Kitchen Sanctuary
Why I Cook Meat Straight from the Freezer (& why you should too)
Study: Freezing steak improves tenderness of some cuts, Kansas State University