Wash and slice peppers. Remove seeds for a milder spice level.
Pour sugar and water into a saucepan. Heat up and stir until the sugar dissolves. Do not bring to a boil.
Remove from heat and stir in the jalapeños. Let sit for 30 minutes — or longer for a spicier syrup.
Store in a mason jar or other airtight container in the fridge for up to 1 month. If the syrup begins to look cloudy, it’s time to toss it.
Notes
Handling peppers: Here’s a tutorial on how to slice jalapeños. You may want to wear gloves and be sure you wash your hands with soap before you touch your eyes or face.Adjusting the spice level: For a spicier syrup, leave some or all of the seeds to up the heat level. You can also leave the peppers in your syrup overnight to infuse more flavor.For a milder syrup: You have a few options for a less spicy syrup.
Use one pepper instead of two.
Remove all or most of the seeds.
Remove the peppers when the syrup has reached your desired spice level. (Taste your syrup frequently!)
If it winds up too spicy, mix in a little classic simple syrup to dilute the flavor.