Instructions

1. Preheat the oven to 200°C.
2. Finely chop the mushrooms and garlic. Slice the leeks. Mix them together with the oregano and some seasoning.
3. Prepare two large square sheets of foil or parchment paper. Divide the mixture onto the middle of the sheets. Crumble some soft butter or spread over them, then fold in the sides, then wrap up, creating tight parcels.
4. Put the parcels on a baking sheet and bake for 35 minutes.
5. Carefully unwrap the parcels and serve warm.