You will need:
1 large avocado(good quality,Hass)
1 garlic clove(sliced)
1 handful cilantro
chile flakes (optional)
1-1 1/2 cups water
Directions: Wash and cut jalapeno into quarters.Take the seeds out. My jalapeno wasn't so spicy. Blacken the jalapeno on a hot dry skillet. I like to press on them, with a flat spatula, so that the jalapeno gets charred on most of the surface. I turn them over and blacken both sides.
Cut avocado and scoop the flesh into a food processor bowl. Add the cilantro, jalapeno, garlic salt, pepper and 1/2 cup of water.
Process till fine and smooth. Add additional water to make it a thinner. This is where you can leave it thicker in consisiteny if you like or add some more water to make it thinner. For mine, I added the full 1 1/2 cups. Season again with some salt(if needed) and some lime juice. If it isn't spicy enough, you can add some chile flakes.
You can leave the avocado seed in the sauce and it won't turn brown on you.