U.S. Beef Wellington : The Marbled Meat Club

Ingredients

• 500 g U.S beef tenderloin, cut in half
• Salt and black pepper to taste
• 30 ml olive oil
• 20 g English mustard
• 450 g fresh mushroom
• 1 garlic clove
• Salt & black pepper to taste
• 110 g fresh baby spinach
• 300 ml water
• 1 egg
• 160 g all-purpose flour
• 1 pinch of salt
• 2 puff pastry sheets (230 g each)
• 10 ml whole milk
• 1 small onion, finely chopped
• 70 ml balsamic vinegar
• 30 ml soy sauce
• 500 ml beef stock
• 40 g butter