Step 4: Making the sauce.
In a large frying pan, saute 1 thick slice of an onion in a little oil until brown. Add about 10 medium tomatoes cut into large chunks and let them simmer until everything has dissolved into a sauce. About 30 minutes.
While the tomatoes simmer, boil the 8 chile Californias until soft. This wont take very long.
Cut open the chiles and remove the seeds from the inside.
Put the chiles into a blender with 3 cloves of garlic and 1tsp. cumin.
Blend until liquid, this is going to be thick. Add water until you get a nice sauce. Set aside.
If you like a little spice in your food, boil a couple dry chiles (spicy ones) with the chile California's
When the tomato and onions have dissolved, add the blended chile sauce from the blender to the tomato and add salt to taste. Let the chile sauce boil until thick, but not too thick. Don't worry, you can always add more water.