Cacio e Pepe vs. Alfredo vs. Carbonara

The difference is what makes the sauce creamy. Cacio e pepe is pecorino or parmigiano, black pepper, and starchy pasta water emulsified together, with no cream and no egg. Alfredo, as it is served in American restaurants, is butter, cream, and parmigiano cooked into a rich sauce. Carbonara is a third thing entirely: raw egg and grated cheese tossed with hot pasta so the egg thickens into a sauce, plus rendered guanciale or pancetta. Three sauces, three completely different thickeners.

Comparison at a glance

All three are white pasta sauces with cheese and black pepper in them, which is why they get confused. What separates them is simple once you know where to look: does it have cream, does it have egg, and does it have meat.

Dish	Core ingredients	Has cream	Has egg	Has meat	Origin	On the Chef's Roma Kitchen dinner menu
Cacio e pepe	Hard cheese, black pepper, pasta water	No	No	No	Rome	Spaghetti Cacio e Pepe, $22.00
Alfredo	Butter, cream, parmigiano	Yes	No	No	Rome, then rewritten in the United States	Pappardelle Alfredo, $25.00
Carbonara	Egg, pecorino, cured pork, black pepper	No (traditionally)	Yes	Yes	Rome, mid twentieth century	Not served

What is cacio e pepe?

Cacio e pepe means cheese and pepper, and that is close to the whole ingredient list. Grated hard cheese and cracked black pepper are combined with some of the salty, starchy water the pasta cooked in, and the starch binds the cheese and water into a glossy sauce that coats the noodles. It is a Roman dish, and it is one of the four classic Roman pastas alongside carbonara, gricia, and amatriciana.

Traditional cacio e pepe contains no cream. The creaminess comes from the emulsion, not from dairy fat added at the end. That is also what makes it a technically demanding dish despite the short ingredient list: too hot and the cheese seizes into strings, too cool and it never comes together.

At Chef's Roma Kitchen, Spaghetti Cacio e Pepe is listed as fresh cracked pepper and parmigiano, at $22.00. It is the least expensive pasta on the dinner menu.

What is Alfredo?

Alfredo is the cream sauce most American diners picture when they hear white pasta sauce: butter, heavy cream, and grated parmigiano reduced into something thick enough to cling to a wide noodle. It is rich, mild, and forgiving, and it takes additions well, which is why menus so often offer it with chicken or shrimp.

The original Roman version was closer to cacio e pepe than to what Americans order. It was butter and parmigiano tossed with fettuccine, with no cream at all. The cream is an American addition that stuck so thoroughly that the cream version is now what the word means on almost every menu in the United States. So when someone says Alfredo is not really Italian, what they mean is that the cream is not.

At Chef's Roma Kitchen, Pappardelle Alfredo is listed as fresh cream, butter, and parmigiano, at $25.00. Chicken, shrimp, or salmon can be added for an additional charge.

What is carbonara, and why it is neither of the other two

Carbonara is a Roman pasta built on raw egg. Beaten egg (often yolks alone) is mixed with grated pecorino and a heavy amount of black pepper, then tossed off the heat with hot pasta and rendered cured pork, usually guanciale, sometimes pancetta. The residual heat cooks the egg just enough to thicken it into a sauce without scrambling it.

People call carbonara a cream sauce because it looks like one. Traditionally there is no cream in it. The silkiness is egg yolk and cheese. And unlike both cacio e pepe and Alfredo, carbonara is not vegetarian: cured pork is structural to the dish, not a garnish.

An easy way to keep the three straight: cacio e pepe is the base, carbonara is the base plus egg and pork, and Alfredo is the base rebuilt with cream and butter instead of pasta water.

Worth saying plainly: Chef's Roma Kitchen does not serve carbonara. If carbonara is specifically what you are after, order it somewhere that lists it. The dinner menu covers cacio e pepe and Alfredo, and a full range of red sauces, but carbonara is not on it.

Which one should you order?

Order cacio e pepe if you want the sharpest, most savory version of a cheese sauce, and if you like black pepper as an actual flavor rather than a background note. It is the lighter of the two on the menu, and the one that tastes most like the ingredients it is named after.

Order Alfredo if you want rich and mellow. Cream rounds off the salt and the pepper, and the wide pappardelle carries more sauce per bite than spaghetti does. It is also the better choice if you want to add a protein, since the sauce is built to absorb one.

If you cannot decide, there is a low commitment way to settle it. Both dishes also appear on the sides list: Side of Cacio e Pepe is $9.00 and Side of Alfredo Pappardelle is $9.00. Two sides for a table is a cheaper comparison than two entrees, and it lets everyone taste both before anyone commits to a full plate.

Where to try them in Las Vegas and Henderson

Both pastas are on the dinner menu at both Chef's Roma Kitchen locations: Henderson, at 1550 W Horizon Ridge Pkwy Ste P, Henderson, NV 89012, phone (702) 331-6300, open daily from 4 PM to 2 AM, and Southern Highlands, at 10420 S Decatur Blvd #100, Las Vegas, NV 89141, phone (702) 888-3414. Executive Chef Ricardo Romo runs both kitchens with more than 30 years of experience, including Michael Mina at MGM Grand, STK at the Cosmopolitan, Mastro's Ocean Club, Toca Madera, and Beer Park at Paris Las Vegas.

For the full range of pasta, see our guide to pasta in Las Vegas and the Henderson Italian restaurant page, or go straight to the dinner menu. If you are also deciding between chicken dishes, we broke those down in Chicken Parmigiana vs. Piccata vs. Marsala vs. Francese.

Frequently asked questions

Is cacio e pepe just Alfredo without the cream?

Not quite, though that is a useful first approximation. Both are cheese and fat sauces without tomato. The real difference is the technique: cacio e pepe gets its texture by emulsifying cheese with starchy pasta water, while Alfredo gets its texture from cream and butter. Cacio e pepe also leans hard on black pepper as a primary flavor, which Alfredo does not.

Does real cacio e pepe have cream in it?

No. Traditional cacio e pepe is cheese, black pepper, and pasta water, and the creaminess is an emulsion rather than added dairy. Some kitchens do add cream as insurance against the sauce breaking, so the honest answer is that it varies by restaurant. On the Chef's Roma Kitchen menu, Spaghetti Cacio e Pepe is described as fresh cracked pepper and parmigiano.

What is the difference between Alfredo and carbonara?

Alfredo is thickened with cream and butter and contains no egg and no meat. Carbonara is thickened with egg yolk and cheese and always contains cured pork, traditionally guanciale. They look similar on the plate because both are pale and glossy, but they share almost no ingredients beyond cheese and pasta. Anyone avoiding egg or pork should treat them as very different orders.

Is Alfredo actually Italian?

The dish began in Rome as butter and parmigiano tossed with fettuccine, so the idea is Italian. The heavy cream that defines Alfredo in the United States is an American addition, and cream-based Alfredo is not something you will commonly find on menus in Italy. Both statements are true at once, which is why the question generates so much argument.

Where can I get cacio e pepe in Henderson, NV?

Chef's Roma Kitchen Henderson serves Spaghetti Cacio e Pepe at $22.00, with a $9.00 side portion also on the menu, at 1550 W Horizon Ridge Pkwy Ste P, Henderson, NV 89012, phone (702) 331-6300, open daily from 4 PM to 2 AM. The Henderson location has served the area since February 2023 and holds a 4.7 star rating across 304 Google reviews. More detail is on our Henderson Italian restaurant page.