Coarsely chop the 4 to 8 fresh hot chilis and discard stems.
Place the chilis and their seeds, the 2 garlic cloves, juice of 1 lemon, pinch of salt, and as much of the 1/2 to 1 cup extra-virgin olive oil as you wish in a food processor fitted with a metal blade and purée.
Pour the mixture into a small glass jar and let steep at least overnight in the fridge.
You can strain the mixture and return it to jar, but I like mine with a bit of texture. The sauce will keep in the refrigerator for 4 days.
Notes
This sauce lasts up to four days in the fridge. No more. Can we all say it together, "Botulism!"