i’m not good at measurments AND i’m a novice when it comes to cooking. can anyone convert this recipe for…?

1lb of pork roast instead of 3-4lbs
the recipe:
This is an easy pork roast to prepare for a special dinner or everyday meal.
Ingredients:
•1 boneless pork loin roast, 4 to 5 pounds
•Cajun seasoning or seasoned salt blend
•ground black pepper
•1/2 cup Lyle’s Golden Syrup or light or dark corn syrup*
•3 tablespoons packed brown sugar
•1/3 cup mustard, your favorite [...]