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1
Inspect 4 half-pint jars for cracks and rings for rust, discarding any defective ones. Immerse in simmering water until sauce is ready. Wash new, unused lids and rings in warm soapy water.
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2
Combine vinegar, water, serrano peppers, jalapeno peppers, tomatoes, and salt in a saucepan over medium heat. Bring to a simmer and cook sauce for 50 minutes.
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3
Run sauce through a tomato mill or a fine-mesh sieve 3 times.
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4
Pack sauce into hot, sterilized jars, filling to within 1/4 inch of the top. Run a clean knife or thin spatula around the insides of the jars to remove any air bubbles. Wipe rims with a moist paper towel to remove any spills. Top with lids and screw rings on tightly.
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5
Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil and lower jars 2 inches apart into the boiling water using a holder. Pour in more boiling water to cover jars by at least 1 inch. Bring to a rolling boil, cover, and process for 10 minutes.
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6
Remove the jars from the stockpot and let rest, several inches apart, for 24 hours. Press the center of each lid with a finger to ensure the lid does not move up or down. Remove the rings for storage and store in a cool, dark area.
