Ultimate beef wellington recipe | Sainsbury`s Magazine

Ingredients

• 1 x 200g pack British speciality mixed mushrooms
• 2 x 450g packs closed cup chestnut mushrooms
• 1 x 500g block puff pastry
• 4 tbsp vegetable oil
• 100ml Madeira
• 2 shallots, finely diced
• 1 garlic clove, finely chopped
• ½ x 15g pack thyme, leaves picked
• 1kg beef fillet, trimmed of any sinew (ask at the butcher’s counter – you want one that’s evenly sized)
• 30g English mustard
• 3 large egg yolks, beaten with 1 tsp water
• 1 tbsp mixed black and white sesame seeds (or just one type)
• a pinch of flaky sea salt
• 150g plain flour
• 1 large egg
• 325ml semi-skimmed milk
• 30g unsalted butter, melted