Step 1

Add the lemon juice, sugar, rice vinegar and water to a small saucepan. Using a handheld whisk, mix all the ingredients until combined.

Step 2

Place the saucepan over low heat. Simmer for about 5 minutes, whisking every now and then to ensure the mixture doesn't stick to the pan.

Step 3

Add in the cornflour, and continue to whisk until the lemon sauce has thickened up. If it's too thick, add a little more water. If you feel it's too thin, add a tad bit more cornflour.

Step 4

Serve hot or cold as desired.