It turns out gazpachos date back long before the tomato made its way from the Americas to Spain. The root meaning predates the Romans and apparently refers to refuse or leftovers. The pre-tomato gazpachos were a poor man's dish, using old bread or breadcrumbs, water, olive oil, garlic, salt, vinegar and chopped up bits of leftovers (typically vegetables). There were many variants in different regions around southern Spain. I was introduced to the "manchego" version by a friend who grew up in La Mancha.
What follows is my own take on this traditional La Mancha shepherd's meal. They would use whatever they could forage or catch and cook over a small fire. There are many "authentic" recipes, this may not be that authentic, but it works for me. Like other recipes here, this is a kind of framework, around which you can do your own thing.
Ingredients
I like to prepare the chicken & stock before hand. Cooking the chicken to a) make the stock and b) take the meat off the bone for easier eating.