Bring a large saucepan of water to a simmer.
Combine the egg yolks, lemon juice and zest, limoncello if using, water and sugar in a heatproof bowl. Sit the bowl over the saucepan and whisk the mixture until you have a thickened and fluffy sabayon; remove from the heat when the whisk starts to leave a ribbon trail in the mixture. Spoon into 4 martini glasses and garnish with the pared zest on top and a spring of mint.
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