Made exactly as specified. It tastes like nothing so much as ice-cold Lemsip (although I usually fortify Lemsip with a good slug of Scotch). But it's rather nice.
And making the second one with limoncello instead of lemon juice and sugar changes it completely, but makes it just a nice - and probably much more alcoholic
A bit too sweet for me, might increase the citrus to a full shot and leave out the sugar syrup. Otherwise enjoyable and tasted like a herbal caipirinha.
I stumbled across this recipe whilst surfing your site, unfortunately I didn't have lemons but did have limes which seemed more appropriate for a Brazilian cocktail. The green of the limes along with the yellow of the Chartreuse Jaune reminded me of the colours of the Brazilian flag, so I call my twist Ordem e Progresso