I grilled some pork loin for dinner.
Let's make steak with sirloin tonight.
The pork loin cutlet at this restaurant is tender and delicious.
I sliced the loin thinly for shabu-shabu.
ロース is the broader loin category of meat, while サーロイン refers specifically to the well-marbled cut at the rear of the loin.
Sliced ロース is typically counted with 枚, as in ロース肉２枚 for two slices of loin meat.
Borrowed from English 'roast', but in Japanese it specifically refers to the loin cut of meat rather than the cooking method.