Indian relish vs piccalilli

Indian relish

piccalilli

noun
  • A pickle, typically on a base of chopped green (unripe) tomatoes, but sometimes finely-chopped gherkins, and possibly including other vegetables. 

  • A yellow pickle relish made from cauliflower, vegetable marrow, and other vegetables, pickled with vinegar, salt, sugar, and spiced with mustard, turmeric, and other spices. 

How often have the words Indian relish and piccalilli occurred in a corpus of books? (source: Google Ngram Viewer )