01 -
Trim the stems from the jalapenos and slice the peppers into thick rounds. Remove some seeds and ribs if you want a milder sauce.
02 -
Heat the oil in a small saucepan over medium heat. Add the onion and garlic and cook for 2-3 minutes, stirring often, until softened and fragrant.
03 -
Add the jalapenos, vinegar, water, salt, and sugar. Bring to a lively simmer, then cook for 8-10 minutes until the peppers soften and deepen in color.
04 -
Remove the pan from the heat and let the mixture cool for 5 minutes so it is safer to blend.
05 -
Transfer the mixture to a blender. Add the lime juice and lime zest, then blend until smooth. Add a splash of water if the sauce is thicker than you like.
06 -
Strain through a fine mesh sieve for a smoother sauce, or leave it as is for more texture. Pour into a clean jar or bottle and refrigerate before serving.