Make a syrup by boiling the water and sugar. When it has cooled, add the basil leaves, then blend in a blender.
Beat the Tiramisù dessert base in a mixer for approximately 3 minutes with the zest of the two lemons. Transfer to a piping bag.
Pipe a first layer of tiramisù cream in the bottom of the glasses. Top with a ladyfinger biscuit well soaked in basil syrup and lemon confit. Repeat. Finish with a layer of tiramisù cream, lemon zest, lemon confit, and a few basil leaves.
Fresh basil may be replaced by natural basil flavouring or basil puree.