Juice method

• Combine grape juice and sugar in a small saucepan over medium heat.
• Stir continuously until the sugar is fully dissolved and the liquid is clear, about 3 to 5 minutes. Do not boil.
• Remove from heat and stir in lemon juice.
• Let cool for 10 minutes, then transfer to a sealed jar. Refrigerate.

Fresh grapes method

• Add grapes and water to a small saucepan over medium heat. Crush the grapes gently with the back of a spoon as they heat.
• Cook for 8 to 10 minutes, stirring occasionally, until the grapes have fully released their juice and the mixture is bubbling softly.
• Strain through a fine mesh sieve into a clean saucepan, pressing the solids to extract as much liquid as possible. Discard solids.
• Add sugar to the grape liquid and return to medium heat. Stir until the sugar dissolves completely and the liquid is clear.
• Remove from heat and stir in lemon juice.
• Let cool for 10 minutes, then transfer to a sealed jar. Refrigerate.