Mini Beef Wellingtons with Boozy Berry Sauce - Lavender and Lovage

Ingredients

• 1 large free-range egg yolk beaten with 1 tsp water
• Flour, for dusting
• 500g/1lb 2oz pack puff pastry, cut into 4 squares
• 8 slices prosciutto ham (or Parma, Bayonne ham)
• 2 tablespoons dry vermouth
• 1 large sprig fresh thyme
• 50g butter
• 150g mushrooms (I used a mix of chestnut, morels, ceps and assorted wild mushrooms)
• 2 tbsp olive oil
• 4 x 80g fillet steak pieces
• Sea salt and freshly ground black pepper
• 1 x jar mixed berry preserve
• 6 tablespoons red wine