Planter Tom

Planter's Punch is a Standard Rum Drink© the dates back to the 19th century.  It is a variation on punch, or punsch, a word borrowed from the Hindi for a drink made of alcohol, sugar, lemon, water, and spice (or tea).  The British were making their own variations on punch in the 17th century.  Pimm's Cup is a type of punch.
Wikipedia reprints a poem from the August 8, 1908 edition of The New York Times:

    PLANTER'S PUNCH
    This recipe I give to thee,
    Dear brother in the heat.
    Take two of sour (lime let it be)
    To one and a half of sweet,
    Of Old Jamaica pour three strong,
    And add four parts of weak.
    Then mix and drink. I do no wrong —
    I know whereof I speak.

Planter's Punch can have various fruit juices in it (pineapple, orange, lemon), but lime makes the simplest, most straightforward drink.  Starting with the 1-2-3-4 formula, I concocted the drink below.  Surprisingly easy to drink, a couple of these will drop you on your ass.

PLANTER TOM
1 oz fresh-squeezed lime juice
1.5 oz simple syrup (2 oz is too much - even the 1.5 oz makes it pretty sweet)
3 oz Captain Morgan Spice Rum (at first, I was using the Morgan's Private Reserve, but there seems to be little difference between it and the regular old cheaper stuff, so meh)
4 oz crushed ice

Shake all ingredients for 5-10 seconds, then pour into a pint glass.  Letting the drink sit for a minute helps.    Feel free to up the amount of lime to taste.