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1
Finely chop enough button mushrooms to fill one cup. You can also use a food processor to get it very small.
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2
Finely slice 2 medium onions
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3
Melt 2 tablespoons butter and saute the mushrooms for about 5 minutes until they soften, then add the onions.
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4
Turn the heat down and slowly saute the onions. This should take at least an hour. You can stir it periodically. You can add another tablespoon of butter if needed.
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5
While the onions cook, grate one cup of cheese.
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6
Melt 2 tablespoons of butter with 3 tablespoons of marmite. Mix it into the onion and mushroom mixture.
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7
Cook until the onions become thick and the marmite mixture has fully cooked down.
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8
Once the onions are ready, put the mushroom and onion jam in a bowl and let it cool completely before putting it in the fridge.
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9
Once the jam is cold, mix it with the cup of grated cheese.
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10
Let the puff pastry come to room temperature and set your oven to 350 degrees.
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11
Throw some flour on your work surface and roll the pastry sheets slightly.
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12
Now use a cup or glass with a 3 inch diameter. Press out circles on the sheets until you have 36, 12 on a sheet.
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13
Prepare a large cookie sheet with parchment paper.
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14
Put half of the circles on the cookie sheet. Put one large teaspoon of the jam on each and then cover with the remaining circles. By using a fork, press down around the sides of each pie until it is closed.
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15
Mix one egg yolk and a little bit of water. Brush the egg wash over the tops and sides of the pies.
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16
Cut a small cross with a knife in the middle of each pie so that the steam can come out so that the pie does not get soggy.
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17
When done, place it in the middle rack of the oven and cook till golden brown-20 to 25 minutes.
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18
Then cool and enjoy with a nice glass of wine!
