2
Pulse the mushrooms in a food processor with the metal blade until chopped fine. Mix in the tablespoon of olive oil, making sure it coats evenly. Spread out on one or two baking trays (they should be in a thin, even layer) and bake for about 30 minutes, stirring occasionally. They are done when most of the moisture has come out and they are relatively evenly browned. Transfer to a large bowl. If the mushroom residue on the baking tray isn’t burnt, deglaze with a splash of water or wine and scrape as much as you can into the mushrooms – this residue has a huge amount of flavour