Tuna Tetrazzini

Ingredients

• 1/2 lb. spaghettini or linguine
• 11 tbsp. butter, divided
• Freshly ground pepper
• 1/2 lb. mushrooms, thinly sliced
• 4 tbsp. flour
• 1-1/2 cups vegetable or pareve chicken stock (I use bullion cube added to hot water)
• 1 egg yolk
• 1/2 cup cream
• 2 tbsp. madeira wine
• 3 cups cold, cooked tuna
• 1/2 cup parmesan cheese
• 3/4 cup bread crumbs