“Salsa” is Spanish for “sauce,” so “salsa sauce” is redundant. Here in the US, where people now spend more on salsa than on ketchup (or catsup, if you prefer), few people are unaware that it’s a sauce. Anyone so sheltered as not to be aware of that fact will need a fuller explanation: “chopped tomatoes, onions, chilies and cilantro.”
BUY THE BOOK!