Ask the butcher for this, so you get a nice piece of meat.
Rub meat with vegetable oi. Season with salt and pepper and garlic.
Put 1/2" water in a pan. Cook uncovered at 350* for 45 minutes and check the meat. Might need 10 more minutes, depending on how you like it. Formula is 10-15 minutes per pound, but it can need more time, depending on your oven.
Let it rest for half hour before cutting into, that way the meat retains its juices!