If using strawberry simple syrup: add mint and lime to a cocktail shaker and muddle together. I like to add a little bit of crushed ice while muddling. Fill shaker with more ice, add rum and strawberry simple syrup. Shake well, Pour into tall glass. Top with club soda.
If not using strawberry simple syrup, add a couple strawberries (hulled and sliced), mint, lime and tablespoon of sugar. Muddle ingredients then add some ice and rum. Shake well, strain into glass filled with ice. Top with club soda.