Carrots, Seaweed & Smarties

Denim: Sir, I've been reading the back of this Smarties packet. Did you realize they make the purple ones from black carrots? 
Pocket: Purple Smarties do not taste like purple carrots, cadet.
Denim: No sir, that's where they derive the dye from. In fact, all the colors in Smarties come from natural sources. Take radishes, for example.
Pocket: I'd rather not. I'm not big on radishes.
Denim: No sir, but you must admit they've got a pretty red color. The yellow Smarties get their color from lemons. 
Pocket: That makes sense. But how do they make the Blue Smarties? You don't see a lot of blue fruits and vegetables in the supermarket.
Denim: Are you sure you want to know, sir?
Pocket: As Master & Mistress love Smarties, I suppose I ought to be informed.
Denim: They get the blue food coloring from seaweed. 
Pocket: Seaweed?
Denim: Yes sir. It's a particular variety of seaweed called--
Pocket: Never mind the details, cadet. Come on, let's go. I've got an idea for dinner.
Denim: What's that, sir?
Pocket: Sushi. It's supposed to be good for you, and it comes wrapped in seaweed.
Denim: Great! I've always wanted to try a California Roll.
Pocket: If you want to stay here and practice your tumbling, I can go out by myself.
Denim: Uh, no sir. Never mind, sir.