Supermarket AI meal planner app suggests recipe that would create chlorine gas
(www.theguardian.com)
I think it wants three "valid" ingredients (which it may not necessarily use).
They could be oats, bread and water, for example. They could also be "bowl", "plate" and "saucepan", because those words all exist in recipes, and that's what it's checking for.
Bon appetit!