Cardamom Coffee Tiger Cake here too 
I’ve been wondering how coffee instead of chocolate might work out in a tiger cake since I didn’t get around to the cardamom coffee tres leches or tiramisu a while back – turns out, very nicely.
I used instant coffee for the dark batter instead of the cocoa in the tiger cake recipe, and ground cardamom instead of vanilla in both batters. I was worried that the coffee stripes might be too intense, so I decided to add a very light cardamom glaze, but when I tasted the cake later it turned out that the coffee part was just fine after all.
My first round tiger cake!
(But I kind of miss that first wonky drunk clown 
)
