I was worried this would be too sweet with the generous addition of the simple syrup, but it was perfect. Used a Meyer lemon and it was amazing - clean, tart, with just enough cream to evoke meringue. Not too heavy to be a summer drink if one is careful to chill the glass.
Not having all the ingredients to hand and desperate to make this decadent Limoncello cocktail, I made a couple of substitutions which worked really well.... Monins Hazelnut Syrup added complimentary nutty notes and Cointreau was delicious with the cream. Definitely to be repeated.