Ingredients
- 6 medium or 4 large portabello mushrooms, stalks trimmed and cleaned
- 3 onions, peeled and chopped
- 2 tablespoons of olive oil
- 2 tablespoons of butter
- 300g of baby spinach
- 4 sprigs of thyme
- 1 sheet of frozen puff pastry, partially thawed
- 1 egg, beaten
- 1 tablespoon of dijon mustard
- Salt and pepper to taste
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