Weekend Cooking: Mushrooms au gratin

This is a very delicious dish, and is often served as an entrée at first-class dinners.

They are made from what are known as cup mushrooms. It is best to pick mushrooms, as far as possible, the same size, the cup being about two inches in diameter. Peel the mushrooms very carefully, without breaking them, cut out the stalks close down with a spoon, scoop out the inside of the cup, so as to make it hollow. Now peel the stalks and chop them up with all the scooped part of the mushroom, with, supposing we are making ten cups, a piece of onion as big as the top of the thumb down to the first joint.To this add a brimming teaspoonful of chopped parsley, or even a little more, a saltspoonful of dried thyme, or half this quantity of fresh thyme. Fry all this in a frying-pan, in a little butter. The aroma is delicious.

Then add sufficient dried bread-crumbs that have been rubbed through a wire sieve to make the whole into a moist paste, fill each of the cups with this mixture so that the top is as convex as the cup of the mushroom, having first seasoned the mixture with a little pepper, salt, and lemon-juice. Shake some fine bread-raspings over the top so as to make them of a nice golden-brown colour, pour a little drop of oil into a baking-tin, place the mushrooms in it, and bake them gently in an oven till the cup part of the mushroom becomes soft and tender, but take care they do not cook till they break. Now take them out carefully with an egg-slice, and place them on a dish—a silver dish is best for the purpose-and place some nice, crisp, fried parsley round the edge.

From Cassell's Vegetarian Cookery: A Manual of Cheap and Wholesome Diet by A. G. Payne (1891 London, UK)