1. Wash the peppers, then place in a pot, and cover with water. Boil for about 10 minutes, or until they're soft.
When they're soft, remove them fro the water to cool a little. Reserve the liquid for later
2. Remove the stems and seeds, and place the peppers in a blender with the garlic, tomato sauce, and 1/2 of the reserved liquid. Blend until smooth adding as much of the reserved liquid as necessary.
3. Place the blended mixture back into the pot, and simmer about 20 minutes. Strain into a jar, and refrigerate if you're not using it today.