The vegetables need a twenty-minute head start; put the fish on top of them for the last twelve and nothing overcooks. Slice the potato thin enough to see light through, which is the only way it finishes at the same time as everything else.
It did not make it into the plan for these seven days.
The method above is what decides the dish, not a step-by-step recipe. The link runs a web search on the name: this page has no vetted sources of its own, and will not invent any.