Coook☆ She says "cooking" here.

Chin chiiin

First we're gonna mix hot water with instant coffee an' make a cup of coffee.

Use somewhat less water than the amount you usually use to prepare it for drinking and make the coffee a bit thick.

We're not makin' something special today, but...

...at this point you can add sugar and liqueur to suit your taste!

Next, take out your castella!

Chop this fellow into small pieces.