Monty-mum's mum sent a special xmas present from Japan. It's a tiger mat powdered with "Matatabi", aka Silver-vine.
Quote from Wikipedia:
"Silver Vine has long been known to elicit euphoric response in cats. It is the most popular cat treat in Asia, particularly in Japan and China. The reaction to Silver Vine is similar to the catnip response, but appears to be more intense. Typical behaviors include rolling, chin and cheek rubbing, drooling, and licking. The effect usually lasts between 5 and 30 minutes and cats will usually visit Silver Vine again after about 20–30 minutes."