Mrs Figg, cabbage and Polyjuice Potion

[Cindy]

No: HPFGUIDX 111045

I was wondering - this may have been discussed before, I don't know - 
but why does Mrs. Figg's house smell of cabbage (SS p.22), and the 
Polyjuice potion tastes like cabbage (CoS p.216)?  Could Mrs Figg be 
using polyjuice for some reason?  Or maybe, I've missed something in 
reading the books (not as familiar with them as most people here).

Cindy