I do something without a recipe that’s really easy.
Rub loin in garlic (sliced or crushed if you like more).
Spread honey over most of it, thinly.
Pour some orange juice over it (in the roasting pan).
This is from someone who dislikes fruit with meat, btw.
Crush in fingers and sprinkle fairly heavily with the mixed "herbes de provence" (or similar), plus sprinkle salt & pepper.
Roast as usual. Easy and yummy, IMHO.
[edit: agree with those who dislike use of f-word. totally unnecessary IMHO… you can do better. get creative with a thesaurus if you’re hard up…]