Fill a highball glass with ice cubes. Add lemon juice, simple syrup and bitters. Stir. Top up with soda water.
Lemonade has existed about as long as lemons and sugar. To make it a little bit more exciting, we've added aromatic bitters for that nice color. Bitters appeared in the early 1800s as a cure for sea sickness and stomach maladies. Luckily, it's also great for cocktails with, and without, spirits.