In a saucepan over medium heat, add the water and sugar and mix until the sugar has completely melted.
Now add the lemon juice and a couple of lemon slices and bring the heat down.
Let this cook for about 40-60 minutes or until the mixture gets to this deep amber color.
Take it off heat, allow it to cool down and then transfer it to an airtight container.
Notes
If the syrup looks runny when you take it off heat, don't worry. It will thicken as it cools down.
Getting the syrup to that perfect amber color takes time, so be patient.
Remember that it is a low and slow process- don't try to rush things and cook it over high heat, or you'll risk burning the syrup.
Make sure you use a heavy bottomed saucepan to make the syrup.
Once you add the sugar, give the mixture a quick stir and then let it cook without disturbing it. This will help prevent crystallization of sugar and you'll get the perfect thick and sticky syrup you're looking for.
Allow the syrup to cool down a bit before you transfer it to a jar. The syrup is quite hot, and it can risk the glass jar cracking.