Peanuts (groundnuts, கடலை, मूँगफली) are a great source of protein and there is the added bonus of antioxidants, key vitamins and minerals. The fats in peanuts are heart healthy mono and poly unsaturated fats. Peanuts are very commonly eaten as a snack “time pass” in India. The boiled/steamed tender peanuts, roasted peanuts, masala peanuts, chikki (peanut brittle, கடலை மிட்டாய்) are all different ways in which we use peanuts.
A later entrant into the Indian food habit is the peanut butter. This was not a thing when I was growing up. Eating bread or toast meant having it with butter or jam. Later, when I went to Canada after my marriage, I got introduced to peanut butter and it became my favourite thing to have with toast. In fact, even now I enjoy toast with home made peanut butter along with a glass of orange juice.