In a pot, bring water and sugar to boil.

Add mint leaves blended.

Cook the mixture for 15 minutes.

Add citric acid or lemon juice and take away from heat.

Leave it to cool.

When cooled, take a bowl, put the fitting sieve on the top and place clean cheesecloth or tea towel into the sieve.

Pour syrup carefully through. The residue have to be squeezed with spatula or fingers to get all the liquid and color out.

At the end you get deep jade colored syrup ready to be poured into clean glass jars.