In a large saucepan, add 1/4 cup of water and the sugar.

Cook over medium heat, stirring constantly until the sugar has completely dissolved and turns a light golden color.

Add the lemon juice to the sugar mixture. Be cautious as it will bubble up.

Slowly and carefully pour in the boiling water, stirring continuously. The mixture will bubble vigorously, so add the water gradually.

Reduce the heat to low and simmer for about 45 minutes, stirring occasionally, until the syrup thickens and reaches the desired consistency.

Remove from heat and let it cool. The syrup will continue to thicken as it cools.

Pour the cooled syrup into a clean, airtight container. Store at room temperature.