Metalworker putting gold in fruit recipe (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

OR (heraldic term for the colour gold) in LIME (fruit) + R (abbreviation for recipe, in old-fashioned medical prescriptions). I’d vaguely heard of this as a surname but never knew what it meant: someone who makes the metal components of harnesses for horses. You learn something new every crossword.