Update on the lemongrass limeade experiment.
First of all, I have to go to one of the larger New Hampshire liquor stores to buy the everclear (190 proof), which I don't think is available in Maine. If it is, it's probably lots more expensive. Even in New Hampshire, you have to ask for it, and they go out back and get it for you. You will extract as much flavor using vodka, but the extract will be more dilute, and you'll need more vodka.
Now, for the drinks:
I strained out the lemongrass from the simple syrup, and also from the everclear extract. The yield for each was about 1/2 cup.
I squeezed a couple of limes, and made 2 glasses of limeade. One was sweetened with plain sugar syrup, the other with the lemongrass syrup, which took about 1-1/2 ounces per ounce of lime juice.
The glass sweetened with the lemongrass syrup had a distinct and pleasant lemongrass flavor. I put in the refrigerator for later. Then I added lemongrass extract until the second glass tasted of lemongrass, which took about 1-1/2 teaspoons.
It looks like a bunch of lemongrass will give you nine glasses of lemongrass limeade using the syrup, or 24 glasses of slightly alcoholic lemongrass limeade using the extract.
Next I made the ultimate sacrifice of adding tequila to the glass I had out, and now I am drinking it.
It is good.