"Thank you very much, sir." He slips inside and fiddles with the bag before holding it out to him.
"I think it's impolite to call on someone without bringing something, and Cosette said you were fond of hazelnut coffee, so I brought you a pound of it."
Flowers were obviously inappropriate, as was any sort of alcohol (which he couldn't afford anything nice in the way of, anyway), so... coffee it was.
"How are you doing this evening, sir? Well, I hope."