In a food processor, combine chilies, onions, garlic, and a generous pinch of salt. Blend until finely chopped.
Heat oil in a pan over medium heat and add the chopped mixture. Cook for a few minutes until softened.
Add chili powder and sugar, then simmer for about 10 minutes.
Chop the tomatoes and add them to the pan along with apple cider vinegar and apple juice.
Bring the mixture to a boil, then simmer for 20 minutes.
Adjust seasoning as needed and blend the mixture until smooth.
Optionally, strain the sauce for a silkier texture.
Sterilize jars or bottles, then pour the chili sauce into them. Store in a cool, dark place for up to a year.
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