Hard boil meat (be it beef, chicken or pork) in 2 boullion cubes and 16 ounces of water for the most tender meat that even a small child can eat without teeth or an adult without their dentures. Take the meat flavored water to make a low calorie gravy with the directions that are on any corn starch box. This is the only way I have made gravy in over 20 years, IT IS THAT GOOD AND EASY.
Tenderizing meat, either manually or with a solution, makes for a tasty dish. This page is about how to tenderize meats.
Even cheaper cuts of meat come out moist and tender when cooked as a pot roast. This page contains pot roast recipes.