From an old neighbor, Leona
½ white onion
14.5 oz can diced tomatoes (not drained)
Fresh cilantro (to taste)
3 Serrano peppers
2 jalapeño peppers
CUT peppers in half lengthwise and trim tops / seeds.
COMBINE ingredients in blender and blend until desired consistency.
For a roasted flavor, brown off peppers in a pan with NO OIL.
If it is too caliente, add a bit of lemon juice. It will also tame after it is chilled in fridge.