In an 10" pan, fry the bacon until the fatty portions are just beginning to turn clear. Add the onion, and saute over high heat until the onion is translucent. Drain off the fat, remove the bacon and onion, and set aside. Add the garlic to the pan, and deglaze the pan with the wine, scraping up any bacon leavings. Simmer for about 1 minute. Add the half-and-half to the pan, and wait until the sauce come back up to the simmer (with practice, this can be done so that the half-and-half does not curdle in the wine. If it does curdle, thats okay - the taste will still be there, it just wont look as nice). Add the Romano cheese (parmesan is acceptable, but the taste will be a little more pungent), and stir until smooth, about 30 seconds. At this point, the sauce may be removed from the heat and held for about 15 minutes. To serve, bring the sauce back up to temperature. Add the cooked fettucini to the pan and toss to coat the pasta. Add the bacon, onion and raw egg yolk, and toss to mix thoroughly. Dish onto two plates, garnish with a bit of chopped parsley, and serve immediately.