Start by prepping your veggies; chop your onion, peel garlic, remove jalapeno stem and slice in half, and rinse cilantro.
Next, combine everything in your blender or food processor and pulse until smooth. Taste and adjust seasonings if desired.
Serve immediately or refrigerate for 1-2 hours to let flavors meld. Store in a sealed container in the fridge for as long as it lasts - we've never kept any around long enough to see if it ever goes bad!