Tuna Tetrazzini

• 2 long
• 2 cans tuna
• 1 egg yolk
• 475 ml cannd chicken broth
• 240 ml cream (light)
• 85 gr spaghetti
• 80 gr mushrooms (fresh sliced)
• 60 ml marsala wine
• 55 gr butter
• 34 gr green pepper (chopped)