Japanese matcha powder is a wonder to mix into frostings, ice cream or cream for its Shrek-like colour and astringent taste. Here it pairs beautifully with chocolate for a showstopper dessert. I’ve cooked many chocolate cakes in my lifetime, but this one is the ultimate. My sister-in-law Amy divulged her family recipe to me and the cake has a springy moist texture and a pure cocoa flavour, but is not too rich.