The only nonnegotiables for roast chicken recipes are a) being generous with the kosher salt inside and out and b) letting the chicken sit out for at least an hour, which gives the seasoning time to work its way deep into the meat, meaning every bite is delicious through and through. (bonappetit.com)
It can be anything from making your gym time nonnegotiable or canceling late night plans so you can get enough sleep, to just shutting the computer off or not checking your cellphone after a certain hour. (mindbodygreen.com)
We think of these strategies as nonnegotiable in that they define the territory of assessment for learning. (ascd.org)