Slice jalapeño peppers lengthwise and remove the seeds (or leave them in if you wish.)
In a small saucepan, heat the water and sugar over medium high heat. Stir until the sugar dissolves.
Add the peppers to the water/sugar mixture and bring to a boil. Lower the heat and simmer for 10 minutes.
Turn off the heat and let cool to room temperature.
When cooled, strain out the jalapeños and store the simple syrup in the fridge in a lidded bottle.
Video
Notes
You can use white sugar, organic cane sugar or even honey.I find two seeded peppers to be perfect for me, feel free to add more or less and leave the seeds in. Will keep in the fridge for about a month.