Refrigerate the tins of coconut cream overnight. The next day, open the tins and carefully scoop out only the thick, solidified coconut cream from the top. Leave the liquid behind in the tin, do not use it! Whip the thick coconut cream until light and fluffy before folding it into the mascarpone mixture. This step ensures your coconut matcha tiramisu sets beautifully and has a rich, airy texture without needing double cream.