Salsa was a vegetable-based sauce from Mexico on Earth.
In 2256 on the USS Discovery, Sylvia Tilly asked the food synthesizer to add salsa to Michael Burnham's order of egg white burritos with black beans. Burnham corrected the order to roasted tomato salsa for increased nutritional value. (DIS: "Lethe")
After Discovery arrived at Starfleet Headquarters in 3189, Commander Jett Reno ate blue corn tortilla chips with salsa while being interrogated by a holographic officer. She remarked that the snack made her thirsty and also requested a drink. (DIS: "Die Trying")