Without further ado, let's make our drink. In a highball glass with a sturdy bottom, add the raspberries, lime wedges and simple syrup.
Muddle until the raspberries break down. Add the mint leaves. Gently muddle a few times. Don't feel like you need to overdo it here. We just want to release the oils and fragrance.
Pour in the rum. Add a handful of ice. Stir a few times to chill. Top with club soda. Gently stir to combine.
Place the mint sprig in the palm of your hand. Quickly clap your other hand on top to release the mint's fragrance. Add the sprig to the glass.