Creamy Chicken, Mushroom and Green Chilli soup

large roasted chicken carcass with some of the meat still on*

brown onion (chopped in half (no need to peel))

medium carrots (chopped in half (no need to peel))

salt

black pepper

Water to cover

butter

brown onion (peeled and chopped)

chestnut mushrooms (sliced (Crimini or Portabello work just as well too))

green chilli (sliced (or two if you like it hotter))

garlic (peeled and minced)

plain/all purpose flour (**see notes below for gluten free)

your prepared chicken stock

double/heavy cream

lemon juice

Chopped spring onions (scallions and chopped green chilli)