Baked Butter Garlic Marinated Pork Loin
September 19, 2026
Slice the pork loin and spoon some of the buttery pan juices over the top before serving.
Saturday can carry a little more ambition than a weeknight, but this one does not ask for it. The loin comes out of our case already marinated in butter and garlic, which means the seasoning decision, the marinating time and the cleanup that goes with both have already been handled.
What is left is an oven, a thermometer and about an hour. And one piece of knowledge that decides whether this is the best pork you cook this month or the driest.
It is a loin, not a tenderloin, and the difference is about forty minutes
We have this conversation at the counter constantly, and it is the single most expensive mix-up in the pork case.
A pork loin is a wide, thick roast that runs along the back of the animal, outside the ribs. It is a couple of pounds up to five, it is roughly rectangular, it usually has a fat cap on one side, and it feeds six to eight people. That is what you are holding.
A pork tenderloin is a narrow strap of muscle that hangs underneath the spine, inside the ribcage. It is about a pound, it is two or three inches across, and it tapers to a point at one end. It feeds two to three. It is done in twenty-five minutes.
Two different muscles, sold ten feet apart, with names that are one word off. So somebody brings home a three-pound loin, finds a recipe online, and the recipe was written for the one-pound cut. Twenty-five minutes later they have a roast that is hot on the outside and raw in the middle, and no idea which part of the process went wrong.
Which is why the recipe below does not give you a number of minutes. It gives you a temperature. Roughly twenty to twenty-five minutes per pound at 375°F is the planning figure (call it an hour for a three-pounder) but our marinated loins are cut to different weights, so weigh yours or read the label and do the arithmetic. The clock gets you near the end. The thermometer tells you when you are there.
145°F, and on a roast this size the carryover does the last few degrees
The recipe says 145°F, and that is correct — it has been the USDA recommendation for whole cuts of pork since 2011. You can look it up on the USDA safe minimum internal temperature chart (opens in a new tab).
Plenty of people still cook pork to 160°F because that is what they were taught. On a shoulder you can get away with it. On a loin you cannot. The loin is a lean muscle — the fat cap sits on top of it rather than running through it — so there is very little marbling inside to cover for you. The difference between 145°F and 160°F on a loin is the difference between rosy and sliceable and something you need gravy to finish.
Here is the part that catches people, and it is the opposite of what happens with a small cut. A roast this size has mass, and mass holds heat. Pull a three-pound loin out of a 375°F oven and the center will keep climbing five to ten degrees while it sits there. So you do not wait for the thermometer to read 145°F in the oven. You pull it at about 140°F and let it finish on the counter.
That resting time is not optional and it is not just about juice. The USDA guidance is 145°F plus a three-minute rest, because the time the meat spends at temperature is part of what makes it safe. Three minutes is the floor. On a roast this size, ten is the right answer — long enough for the carryover to finish the job and for the juices to settle so they stay in the meat instead of running out onto your board.
Fat cap up, by the way. As it renders it runs down over the lean meat underneath, which is free basting, and it is the reason the loin is sold with that cap still on.
Baked Butter Garlic Marinated Pork Loin
Prep: 5 minutes · Cook: about 60 minutes for a 3 lb loin · Serves: 6
You’ll Need
- Lil Butcher Shoppe pre-marinated Butter Garlic Pork Loin
- Frozen green beans
- Rice or mashed potatoes
Let’s Cook
Preheat the oven to 375°F.
Place the pre-marinated pork loin in a baking dish and bake until the thickest part reaches 145°F. Let it rest for at least 3 minutes before slicing.
While the pork loin cooks, prepare the green beans and your choice of rice or mashed potatoes.
Slice the pork loin and spoon some of the buttery pan juices over the top before serving.
What Else Is in the Case
The marinated loins are a whole shelf, not a single item. Butter Garlic and New Orleans are the regulars, and both come plain or bacon wrapped — the bacon-wrapped ones baste themselves even harder than the fat cap does, and they want the same temperature and a few extra minutes.
On the rest of the fresh pork side there are stuffed pork chops and the crab stuffed pork loin, which is the same cut as this one with a good deal more going on inside it — same 145°F, same arithmetic on the weight.
If Saturday is a steak night instead, the case runs from fresh hand-cut steaks and rib eyes up through USDA Prime rib eyes, filet mignon, Australian Wagyu and Wagyu tomahawks and T-bones. The steak sides are there for the same reason this loin is: somebody already did the work.
Tips from Behind the Counter
- Buy the thermometer. On a roast this size it pays for itself the first time. Instant-read, into the thickest part, from the end rather than straight down.
- Fat cap up, always. It renders down over the lean meat and bastes it for you. Turn it over and that fat drips into the pan and does nothing for your dinner.
- Pull it at 140°F. A three-pound loin climbs another five to ten degrees on the counter. Waiting for 145°F in the oven means serving it at 152°F.
- Rest it ten minutes, not three. Three is the USDA safety minimum. Ten is what a roast this size needs for the juices to settle and stay put when you slice it.
- Do not trim the marinade off. That butter and garlic is what makes the pan juices, and the pan juices are the sauce.
- Slice it thin and against the grain. The grain runs the length of the roast, so the correct cut is straight across. Thick slices off a lean cut eat dry even when the roast is perfect.
Ways to Change It Up
- Roast the green beans on a sheet pan alongside instead of steaming them, and let them pick up some of the drippings.
- Add halved baby potatoes and carrots to the baking dish so they cook in the butter and garlic.
- Finish the pan juices with a splash of chicken broth and a squeeze of lemon and reduce it for two minutes into an actual sauce.
- Slice leftovers thin for sandwiches with a sharp mustard. Cold marinated pork loin is underrated.
- Try the New Orleans marinade instead for the same cook and a completely different plate.
One Stop for Saturday Dinner in Hattiesburg
Family owned and operated in Hattiesburg since 1991. Hours: Monday–Tuesday and Thursday–Saturday, 9:30 a.m. to 5:30 p.m. Closed Wednesday and Sunday. Phone: 601-261-2765. Address: 1910 Broadway Drive, Hattiesburg, MS 39401. Smoked sausage ships nationwide; also on shelves across Mississippi and the Gulf South.
Saturday is our last day of the week, and we close at 5:30 p.m. If this is Saturday’s dinner, come get it Saturday morning rather than Saturday evening.
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