Purists will want to use castor sugar, I used Truvia baking blend which is a sugar substitute that contains real sugar, ‎erythritol, and stevia extract. One teaspoon of Truvia has the sweetness of 2 teaspoons of sugar (which you should use, if using regular or castor sugar) and only 10 calories - making this cocktail even "skinnier".
Meyer lemons are in season now - they are not as tart, have a smooth skin and are more orange in color than regular lemons.