1. Make the ginger syrup. Combine the ginger, sugar, water, and salt in a saucepan and bring to a boil. Simmer for 50 minutes and set aside to cool. Strain and refrigerate.
2. Once the ginger syrup has completely cooled, line the sides of a 10” round springform pan with parchment (use a little cooking spray to help it stick to the pan). Place a 10” cardboard cake round in the bottom of the pan and set aside. (note: this will work with an 8” or 9” springform pan too, the cake will just be a little taller!)
3. Make the lemon mascarpone cream. Combine the whipping cream and powdered sugar in a chilled bowl and whip on medium until soft peaks form. With the mixer still running on low, add in the mascarpone, lemon juice, limoncello, lemon zest, food coloring and salt. Turn up the speed and mix on medium until stiff peaks are formed. Cover and refrigerate.
4. Make the ginger whipped cream. Combine the whipping cream, ¾ cup of the cooled ginger syrup, and a pinch of salt in a chilled bowl and whip on medium until soft peaks form.
5. Layer your cake! In your prepared pan, arrange a single layer of cookies on the bottom. Using an offset spatula, spread a layer of lemon whipped cream over the cookies. Cover the lemon cream with more cookies, followed by a layer of the ginger whipped cream. Continue this pattern until you’ve used all of your lemon & ginger whipped creams. Cover tightly with food wrap and place in the freezer. Freeze for 3 hours or overnight.
6. An hour before you’re ready to serve the cake, take it out of the freezer. Remove the sides of the springform pan and let the cake begin to thaw on the countertop. If necessary, smooth the sides out with an offset spatula.
7. Make the whipped cream topping. Combine the whipping cream, powdered sugar, and a pinch of salt in a chilled bowl and whip on medium until soft peaks form.
8. Top the cake with the whipped cream (pile it on high!). Decorate with candied lemon slices and fresh mint leaves. Serve immediately!
NOTE: If you want the cake the slice perfectly, put it back in the freezer for an hour before you slice it. The cake tastes better slightly thawed, though, so let the pieces sit out for half an hour or so before serving.
NOTE #2: You’ll have some ginger syrup left over. LUCKY YOU. Add it to sparkling water, ice cream, hot tea, etc.
Directions for Tumeric Food Coloring
1. To make this, combine the water, sugar, and turmeric in a saucepan and bring to a boil.
2. Turn the heat down and simmer until the mixture has reduced in half, about 30 minutes, stirring occasionally. Strain and refrigerate.