To make the caramel: Pour sugar, lemon juice and water into a small saucepan and heat over medium-high heat. Heat until bubbles form and the mixture is simmering. DO NOT STIR. Occasionally lift the saucepan and swirl the mixture, very gently, while the sugar is heating. In about 10 minutes, the sugar will start to caramelize. Resist the urge to stir. Let the mixture simmer until it reaches a rich, dark amber color and remove from heat.