We know nothing good or bad about Gourmetours Peru's food, but assume it's good based on the owner's knowledge and experience. Established competitors look like they give you a lot more for your money though. Tripadvisor gives 5-star rating to The Lima Gourmet Company https://www.tripadvisor.com/Attraction_Review-g294316-d2358313-Reviews-The_Lima_Gourmet_Company-Lima_Lima_Region.html https://www.limagourmetcompany.com/food-tours-lima.html offers day tour for $130 and evening tour for $135, or $265/day, or $795 (plus lodging) for 3 days. Compare to more than $5000 for Gourmetours Peru for 3 days (as of Dec. 1 2017), seems to include lodging though.
We do not represent the Lima Gourmet Company; https://www.tripadvisor.com/Attraction_Products-g294316-zfc12053-zfg11868-Lima_Lima_Region.html for 4 and 5 star food tour options that compete with the Lima Gourmet Company as well as Gourmetours Peru.