Squeeze 4 lime wedges into a highball or Collins glass, then drop wedges into glass. Add strawberries, 3 level bar spoons of sugar, and 1 ounce club soda to glass.
Using a muddler, press and twist ingredients together a few times, or until strawberries are mashed. There should still be chunks; do not pulverize ingredients.
Stack mint leaves in the palm of your hand. Smack leaves with your other hand, 5 to 6 times, or until fragrant.
Rub leaves over the rim of the glass, then drop in.
Add rum to glass, then fill with ice. Top off with club soda.
Use a bar spoon to vigorously mix ingredients until drink is evenly mixed.
Serve drink immediately, garnished with a sprig of mint and a fresh strawberry, if desired. Enjoy!