This tends to break up the tissue fibres too much and allows the natural juices to be released too quickily. Fry on a very high heat and finishing in the oven will give you a much better tasting cut of meat, especially if you then allow it to sit for at least 5 mins after cooking.
sLOW COOKING ONLY WORKS ON LARGE PIECES OF MEAT UNLESS YOU BRAISE THEM, FINISHING YOUR STEAK IN THE OVEN WOULD JUST DRY IT OUT. The whole theory to slow cooking is that you cook your meat without damaging the tissue and the low heat for a longer period of time turns and grissle into jelly wich makes it mor pallatable.
Meat is a muscle when you heat it it contracts this bursts the tissue hence you have the bleeding.
Tenderising it splits the tissue apart enabling it to be cut easily and chwed easily this damages the meat and does result in a dryer cut of meat
Spend extra money get a good cut
Keep the cheap cuts for roasting