The marinade is mainly for flavouring the meat but it also makes it tender.
Marinades always contain some kind of acid, often wine or vinegar.
It is the acid in these products that makes the meat tender Eurospice Tip Use around 1-2 dl marinade for 1Kg of meat. Most economical for the shop will be to vaccum pack the meat. The consumer can easily put the meat in double plastic bags and turns over once in a while during marination. Steaks are to be marinated 24-48 hours in marinade in a fridge. Slices of meat only have to be in marinade for 1 to 3 hours.