Simple Syrup: Heat sugar and water in saucepan over low flame until sugar is completely dissolved. (Simple syrup can be stored in sealed container in refrigerator for up to 2 weeks.)
In a mixing glass, gently muddle the mint leaves, simple syrup and lemon juice. Fill pint glass with ice. Shake all ingredients well and strain using a spring strainer over fresh ice. Top with club soda and garnish with mint leaves and a lemon wheel.