Oh, I forgot to mention, I don't own Sherlock.
"'Five pounds each: potatoes, lemons, and tomatoes'?"
"Experimenting with electrical currents and the corrosive properties of foods."
"Any particular reason?"
"A death involving a rather odd meal. Just need to see if the recipe could have killed her husband."
"You think she killed him by cooking dinner?"
"No, her husband killed her; strangulation. I'm looking for motive."
"Right. Do the tomatoes have to be fresh or can they be canned?"
"Fresh of course…Problem?"
"No, not so long as you don't mind paying for five pounds out of season tomatoes."
"I'm sure the account can handle it. If not I'll give you Mycroft's card."
"You picked Mycroft's pocket?"
"No, of course not. I pick-pocketed his assistant. I'm sure she has her uses, Mycroft wouldn't keep her around otherwise, but she is dreadfully unobservant."
"Everyone is next to you two."
"Well yes, at least in my case. Mycroft has been slipping lately."
"And you're basing that statement off of the fact that he didn't immediately call you out on pick pocketing his assistant, likely when he wasn't even there?"
"He has his precious cameras. Besides he should have seen it coming and warned her. That last kidnapping was uncalled for. He knew I needed you here for the Jonson case and he did it anyway."
"So you did it for revenge."
"hmm, Also as a warning."
"Warning? You don't think that's going to stop Mycroft do you?"
"No but next time maybe he'll think twice about the location. Those warehouses are dreadfully drafty and you had a cold."
"That's very…um— er…"
"You were going shopping."
"Yes. Right. Good. Shopping."
"Take a taxi, the tomatoes will bruise otherwise."