MCM, I love the idea of the asparagus.....
There is another one that a neighbour used to make. Plain boiled, sliced potato layered with asparagus and the sauce was boiled egg, some of the as-gus water and ????? it was a very yummy dish.
I sometimes make mash potato around the casserole and the filling is a thick white sauce with chopped asparagus and boiled eggs, a variation on plain 'Egg and Potato Pie', my most favourite comfort food dish.