For greasing:melted butter750 gmsoftened cream cheese500 gmmascarpone190 gmraw caster sugarFinelygrated rind of 2 limes and juice of 14eggs250 gmsour cream140 gmstrawberries, coarsely choppedSweet ginger pastry125 gmsoftened butter30 gmpure icing sugar, sieved125 gmplain flour2 tspground gingerStrawberries in ginger syrup300 gmraw caster sugar2 tbspginger, cut into julienneJuiceof 2 limes500 gmstrawberries (about 2 punnets), coarsely chopped
For sweet ginger pastry, preheat oven to 150C. Beat butter and icing sugar in an electric mixer until light and fluffy (2-3 minutes), sieve over flour and ground ginger, stir to combine. Turn onto a work surface, bring together with the heel of your hand, roll out to 4mm thick and line the base of a 27cm-diameter, 5cm-deep fluted tart tin, trimming edges. Refrigerate to rest (30 minutes), prick with a fork, blind bake until light golden (15-20 minutes), remove weights, bake until crisp (4-5 minutes), cool.
Lightly brush sides of tart tin with butter. Process cream cheese, mascarpone, 165gm raw caster sugar, lime rind and juice in a food processor until smooth, scrape down sides then add 3 eggs, one at a time, processing to combine. Pour over pastry, bake until just set (40-45 minutes).
Process sour cream, strawberries and remaining raw caster sugar in a food processor until smooth, add remaining egg and process to combine. Ladle over cheesecake and bake until just set (8-10 minutes). Cool, then refrigerate until completely chilled (4-5 hours).
Meanwhile, for strawberries in ginger syrup, combine raw caster sugar and 250ml water in a saucepan, stir over medium-high heat until sugar dissolves. Bring to the simmer, add ginger, cook until ginger is translucent and liquid is reduced to a light syrup (5-6 minutes). Remove from heat, add lime juice and half the strawberries, refrigerate until chilled. Add remaining strawberries, serve with cheesecake.