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Slice the mushrooms, stems on, about 0.5cm thick. Halve the chestnuts and scoop out the flesh with a spoon.
Heat a pan well, add 1 tsp olive oil, spread the mushrooms in a single layer, and let them sit undisturbed for 1-2 minutes. Once golden, flip and cook the other side.
Add the chestnuts, lightly mash with a spatula, sauté together for about 1 minute, and season with pepper.
Toast the sourdough until crisp and spread with ricotta. (Mixing in a little milk makes the ricotta even creamier.)
Top with the mixture from step 3, drizzle with a few drops of truffle oil, and finish with truffle salt.