Put on gloves to avoid pepper hands. Slice the jalapenos, discard the stems, and keep the seeds for heat.

In a small pot, combine jalapenos, garlic, optional onion, salt, water, and vinegar. Simmer for 10-12 minutes until soft.

Let the mixture cool, then transfer to a blender and blend until smooth.

Stir in lime juice and adjust consistency with more water if needed.

Taste and add a pinch of sugar if it's sharp.

Store in a glass bottle or mason jar in the fridge for at least 2 weeks.