Fettuccine alla Papalina - Miz En Place

Ingredients

• 13 ounces tagliatelle
• 5.5 ounces prosciutto
• 2/3 cup heavy cream
• 2 tbsp unsalted butter
• 2 egg yolks
• 1/4 onion
• 2-1/2 tbsp grated parmesan cheese
• 1 pinch salt
• freshly ground black pepper, to taste