The ancient Roman roots of pesto
Since there are many different dishes one can prepare by grinding a mixture of ingredients in a mortar, there are also a few different dishes that are called pesto or that are related to the history of pesto in some way, no matter how closely. Ingredient lists are indeed.
To follow the etymology wormhole even further, if you look beyond Genoese, you can find that pesto-like words existed in ancient Latin as well. According to the vocabulary, “The origin of pistil is the Latin word pistillum, which means ‘pistil.’ This can help you remember that a pistil is a pistil.”
Over time, different forms of pesto emerged depending on what ingredients were available seasonally and geographically, but if the result could be spread on bread or meat, eaten over pasta, or for some similar use, it was called pesto.