skizziks

Take a hunk of beef and braise it, that is, cook it in simmering liquid like beer or tomato sauce and wine, for many hours, which will soften the meat and add flavor. As stated, you need meat that has fat. If you start with a thin slice of meat, marinate it in acid (lime and lemon and orange juice) to soften it up a bit.

oy yeah i just remembered, you can also marinate overnight in 7-up or coke, ala korean bulgogi.