2 garlic cloves, sliced
2 leeks, sliced
350g/12oz mushrooms (such as chestnut or button mushrooms)
15g/½oz dried mushrooms (optional), soaked in 150ml/5fl oz freshly boiled water
large sprig thyme, leaves only
1 tsp Dijon mustard
350g/12oz plain flour
50²µ/1¾´Ç³ú plain flour
200g/7oz vacuum-packed chestnuts, left whole
pinch salt
200–300ml/7–10fl oz vegetable or chicken stock (amount depending on whether or not you are using dried mushrooms)
200g/7oz butter, chilled
50²µ/1¾´Ç³ú butter
1 free-range egg yolk
100ml/3½fl oz marsala