The version to make when the tart is the point of the evening rather than the thing after dinner. Everything that usually goes wrong — a soggy base, a filling that scrambles or weeps — is headed off by a step you can measure, and the whole thing is built in stages you can stop between.
The sauce that turns a plain pan-fried steak into something worth sitting down for, and it can be finished a day early and reheated — so the only thing left to do at dinner time is cook the meat.
A quiche with no pastry to make: the crust is a layer of thin sweet potato slices, so there is nothing to roll, chill or blind-bake. Make it on a Sunday and breakfast is already done for most of the week.
The base method, filling left open. A layer of sweet potato slices stands in for pastry, so there is nothing to roll, chill or blind-bake — and whatever needs using up in the fridge becomes the filling.