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.
Fill a highball glass with ice cubes. Add lemon juice, simple syrup and bitters. Stir. Top up with soda water.