I cook it the way my mom taught me - in a pot of water that comes up half way on the hunk of meat. I use ALOT of pickling spices (same thing that comes in that TINY spice packet they include). I use 3-4 times the amount of what's in that packet - I like some flavor. I would defininetly add soem garlic and oinions to the water while it's cooking and twaords the end of the cooking time add the potatoes and eventually the cabbage.
A warning the meat shrinks ALOT. It will be half the size when it's done. Brisket has the most fat and will shrink the most - there are other cuts - and basically the more it cost, per pound, the more tender it will be and the less it will shrink. But if the brisket appears to be just enough - then get another one.
I would think that cooking it in a slow cooker wouldn't be much diffferent - so I'm sure an online recipe would be fine.
Just this weekend I heard a few different recipes that are worth a try:
- in the oven in a covered roasting pan or cassarole - 1/2 - 1 inch of water in the bottom including potato, onion, (add cabbage eventually)
- same thing as above but heavily slather with home made honey-mustard and wrap foil tightly across the top
- any of the prior methods - but replace water with Guinness.
Good luck and have fun!