Pesto been used for all sorts of cold sauces or dips, mostly without any of the original ingredients: arugula (instead of or in addition to basil), black olives, lemon peel, coriander, or mushrooms. In more northern countries, ramson leaves are sometimes used instead of basil. In the 19th century, Genovese immigrants to Argentina brought pesto recipes with them. A Peruvian variety, known as "tallarines verdes" (meaning "green noodles", from Italian "tagliarini"), is slightly creamier, lacks pine nuts (because of their rarity and prohibitive cost in Peru), may use spinach and vegetable oil (in place of olive oil), and is sometimes served
Bertucci's 36 stores. In 1994, it expanded to Atlanta, Georgia; Chicago; Orlando, Florida; and New Jersey. Bertucci’s had 63 stores by 1995. A $10.4 million wrongful death lawsuit against Bertucci's was filed in July 1995. Janet Walker, of Salem, New Hampshire, went into anaphylactic shock and then slipped into a coma after ingesting pesto sauce that contained nuts. The waitress, according to the lawsuit, failed to mention the nuts. A week later, Walker died. The case never went to trial. Joey Crugnale attempted to take the chain private again in 1998, but though the board approved his attempt, he was outbid.