You should ensure all ingredients are next to your cooking area.
Next step, chop your hazelnuts into small pieces.
Pour water into a saucepan, and add sugar and the chopped hazelnuts.
Turn your stove on and stir the mixture until it boils.
After reaching boiling point, reduce the heat to medium and let the mixture simmer.
Turn your stove off and place your saucepan away from the stove.
Add a tablespoon of vanilla syrup to your mixture and stir.
Allow your hazelnut syrup to cool for a few minutes.
Use your sieve to strain the mixture into a jar and store it in a cool area.
You can refrigerate your syrup to ensure it remains fresh for a long time.