Spread a thin layer of the mascarpone mixture on the bottom of your serving dish. This will sturdy the savoiardi and make it easier to assemble.
Dip each savoiardi into the limoncello mixture until you can feel it soften. This takes longer with a cold liquid, so leave them in there a little longer than you do with a coffee based tiramisu. Flip each savoiardi over so both sides absorb the liquid.
Arrange the savoiardi as you wish – you can pack them tightly or leave a little room between each. Personally, I prefer less savoiardi in this tiramisu, but do what you prefer.
Once the first layer of savoiardi are in place, dollop about 1/3 – ½ the yuzu curd over the top. Spread it out as you dollop because it can be tricky to spread over soft savoiardi. Do your best to create a layer of yuzu curd.
Spread half the remaining whipped mascarpone mixture gently over the top. Spread it right to the edges to ensure everything is coated and sitting in a flat layer.
Repeat the process with the next layer of savoiardi. Spread the remaining whipped mascarpone mixture over the top of the savoiardi.
If your mixture is feeling a bit soft, place the tiramisu in the fridge or freezer for 10-15 minutes. Once it is firmer, gently dollop the remaining yuzu curd over the top of the mascarpone mixture. Use an offset spatula to very gently spread the yuzu curd evenly over the top of the tiramisu. It can take a bit of patience to ensure you don’t disturb the mascarpone underneath, which is why chilling helps.
When you are happy, transfer the tiramisu to the fridge for at least 4+ hours but ideally overnight. You can serve straight from the fridge or allow it to come to temperature on the bench for 15-20 minutes.
Leftovers keep well in the fridge in an airtight container. I haven't tried freezing it but by all accounts, tiramisu is a freezer friendly dessert.