Step 1.
- Muddle fresh mint leaves and lime wedges in a highball glass.
Step 2.
- Add sugar to the mixture and muddle again to release the oils from the mint and juice from the lime.
Step 3.
- Fill the glass with ice cubes.
Step 4.
- Pour over the cognac and top with soda water.
Step 5.
- Gently stir to combine the ingredients.
Step 6.
- Garnish with a sprig of mint and a lime wheel.