One benefit of making a complicated, classic dish like bouillabaisse, as I did last week, is that the process of making it becomes its own version of cooking school. You follow the steps but as you do so, you learn things. For example: making a fumet (or fish stock) may be labor-intensive but your efforts pay off later when that highly flavored broth is poured in with the tomatoes and onions and fish and takes your bouillabaisse over the moon. Why couldn’t I apply a similar strategy with leftover chicken and leftover chicken carcasses? Last week, that’s precisely what I did.