First I take a 5 pound prime rib then I have it sliced in the middle then use butcher twine to tie it back together then I take butter (soft) and I mix garlic salt with some tyme and mix really well.
Spread your butter all over the prime rib then add some Italian seasonings on the outside with some kosher salt. Making sure your meat is at room temp before cooking… Very important.
Put your oven on 500 and cook 5 mins per pound. Hoping you have a meat probe you can use while it’s cooking.
Then after 25 mins or so bring oven down to 200 for around 2 to 3 hours maybe even longer until the meat reaches an internal temp of around 140 or so. then take out and let rest for about 15 to 20 mins before slicing.
Should be rare and thats how prime rib should be served.