Been bartending for quite sometime and this is what I would recommend:
Never use storebought sweet-n-sour for starters. They are always watery and overly sweet. Instead make your own sweet-n-sour. Recipe below:
Make your own simple syrup of equal parts of hot water (doesn't necessarily need to be boiling, just really hot) and sugar. Stir together until mixture becomes clear-this means all the sugar has dissolved. Then add fresh lemon juice in a two (juice) to one (simple syrup) ratio, cups or half cups depending on how much you want to make. You can either squeeze your own lemon juice, then strain the pulp, but I prefer Naked fresh lemon juice. Also Smart-n-Finals carry fresh lemon juice that restaurants use.
After all that...
4 oz of citrus vodka (prefer Absolut, or Ketel One)
2 oz of triple sec (any is fine)
3 to 4 oz of sweet-n-sour (depending on how strong you like your drink)
Shake-n-strain into sugar-rimmed martini glass
Hope this helps!! It does take a little time and shopping but is really worth it!!
I didn't know a Lemon Drop could be a drink--I always thought of it as a shot, as in: chilled regular or citron vodka, served with a sugar-dipped lemon wedge.
If I were to make it as a drink, I might try: two or three ounces of citron vodka, all the juice from half a lemon, and a dash or two of triple sec, shaken with ice and strained. Maybe a little sugar to taste, if it's too sour.