Using boneless chicken breasts poach the meat in either water or chicken stock. If you poach them in chicken stock then save the stock after because now it will be even richer than before and great to make soup or sauces from later. To poach them simply make sure your liquid covers the meat and very slowly simmer them. I’d say it took about 15 minutes but just cut one open and check it for doneness. Then chill the chicken. When the chicken has cooled chop or tear it up. Add ½ a chopped red onion, 2 tbsp of apple cider vinegar and salt and pepper. Add mayonnaise until it holds together well. Chop up about 2 tablespoons of tarragon and then add it in, tasting as you go, until it seems like enough to you.
You can add in halved grapes. I served ours on croissants and with red grapes on the side.