The word salaban is the imperfect form of salar in the third person plural.
See the full salar conjugation

salar

La técnica de preparación de esta carne tiene más de 200 años de tradición y surgió en Yecapixtla por que ahí se vendían todo tipo de carne y los sobrantes se salaban – así nació la cecina.
The preparation technique of this beef has more than 200 years of tradition and it emerged in Yecapixtla because all type of meat was sold there and the leftovers were salted–that's how the cecina was born.
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