1-2 jalapeños for hot, 1/4-1 jalapeño for mild to medium
Read this if you need help shopping for avocados How to pick good avocados. I used a small food processor for this sauce, but a blender works too. Cut each avocado in half, remove pit, and scoop flesh into your processor. Add chiles, stem removed, cut into big chunks, seeds removed if you prefer less heat. Use gloves or coat your hands in oil if the chile bothers your skin. Do not touch anything else until you wash your hands well with hot soapy water. Blend until smooth and taste for heat. You can add more chile after you taste the sauce, so start slow with the heat.
When you get to the heat level you want, add oil (I like limonolio) and a bit of Vegenaise (about 1 tb per avocado). Keep tasting and blending until you have the taste you like. Add salt and pepper last to avoid overseasoning, you may not even need salt. Serve chilled. Keeps in the fridge for a few days if covered in cling film to keep air off the surface of the sauce. Leave the pits in the sauce to help keep from browning.