Meat is soft and tender
If you've gotten a piece of beef that's not so well hung for roast, just pour a glass of cognac over it. This trick makes the meat soft and tender, this also applies to poultry. The cognac taste is no longer to taste / feel. When heated above 70 degrees, the alcohol content is overcooked and the whole family can enjoy the roast.
Steaks are especially tender when you place them in a round bowl with a marinade of vinegar and oil for a few hours, close the bowl and turn several times in between.