Photograph: Tara Fisher
Mix together all the ingredients for the marinade with about 1 teaspoon of salt. Halve the mushrooms or, if they're large, slice into 2cm slices. I simply tear large oyster mushrooms in half. Toss in the marinade, making sure each piece is coated; leave for 30 minutes.
Meanwhile, preheat the grill and whisk together the ingredients for the dressing and season. Grill the mushrooms for 3-4 minutes each side or until lightly charred.
Layer the leaves in a serving bowl with the grilled mushrooms. Drizzle over the dressing and toss well to coat. Sprinkle with the pistachios and serve with the shallots alongside for your guests to add as much or as little as they like.