Name: Tonnarelli cacio e pepe
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Italian, Rome / Lazio
Ingredients: 400 g tonnarelli; 180 g Pecorino Romano DOP, very finely grated; 10 g black peppercorns, freshly crushed; Fine sea salt for pasta water, use less than for plain pasta because Pecorino is salty

Tonnarelli cacio e pepe in a rustic bowl with Pecorino and black pepper

Prep10 minutes

Cook15 minutes

Total25 minutes

Yield4 servings

Jump to recipe ↓

The dish

About Tonnarelli cacio e pepe

Cacio e pepe is a Roman pasta whose short ingredient list leaves no room for a hidden sauce. Pecorino Romano, black pepper and starchy pasta water must form the coating themselves. Turismo Roma describes the defining technique clearly: cheese is mixed with cooking water into a cream and then worked rapidly through hot pasta.

The city’s reference recipe is written for spaghetti, but it explicitly recognises tonnarelli as a familiar variation. Thick, square-cut tonnarelli are particularly good at carrying the cheese-and-pepper emulsion, which is why this page uses them while preserving the same Roman technique.

The main risk is heat. Pecorino added to a pan that is still fiercely hot can tighten into stringy or grainy clumps. The cheese is therefore mixed with warm, starch-rich cooking water away from direct heat until a thick cream forms, then the drained tonnarelli are tossed through it.

Black pepper is more than garnish. Toasting freshly cracked pepper briefly in a dry pan wakes its aroma; a little pasta water added afterward captures those oils and spreads the pepper evenly through the finished dish.

The sauce should finish glossy and loose enough to move, not stiff like melted cheese. Warm plates matter because the emulsion thickens quickly as it cools. The pasta should reach the table immediately.

Technique

Three things that matter

Use finely grated Pecorino. Fine particles melt and disperse more evenly than coarse shreds.
Lower the temperature before adding cheese. The emulsion forms with warm starch water; boiling heat encourages clumps.
Reserve plenty of pasta water. The exact amount needed depends on cheese age and pasta starch, so adjustment happens by texture.

Cook the dish

Ingredients

Everything needed to prepare the dish, arranged for fast scanning before cooking.

Pasta and sauce

400 gtonnarelli
180 gPecorino Romano DOPvery finely grated
10 gblack peppercornsfreshly crushed
Fine sea saltfor pasta wateruse less than for plain pasta because Pecorino is salty

Step by step

Method

Prepare pepper and cheese

Toast the pepper. Crush the pepper coarsely and warm it in a dry wide pan over medium-low heat for 60–90 seconds until fragrant. Turn off the heat.
The pepper should smell strongly aromatic without smoking.
Make a Pecorino cream. Put the grated Pecorino in a large bowl. Once the pasta water is starchy, whisk in about 100 ml warm water a little at a time until a thick smooth paste forms.
The mixture should be creamy and cohesive, not stringy or oily.

Cook and emulsify the tonnarelli

Boil until al dente. Cook the tonnarelli in moderately salted water until al dente. Reserve at least 300 ml cooking water before draining.
The pasta should stay firm enough to withstand vigorous tossing.
Wake the pepper with pasta water. Add about 80 ml hot pasta water to the toasted pepper pan and swirl to lift the aromatic pepper oils. Add the drained tonnarelli and toss briefly.
A thin starchy film should coat the pasta before the cheese enters.
Finish off direct heat. Let the pan cool for 30–60 seconds, then add the Pecorino cream and toss vigorously, adding reserved water in small splashes until the sauce turns glossy and flowing.
No separate cheese clumps should remain; the sauce should cling in a thin creamy layer.
Plate immediately. Divide among warm plates and finish with a little extra black pepper. Serve at once.
The sauce should still look fluid when it reaches the table.

Practical guidance

Tonnarelli versus spaghetti

Turismo Roma presents spaghetti as the classic reference and notes tonnarelli as a familiar variation. The sauce technique remains the same.

Water temperature

If the cheese mixture tightens, stop adding heat and loosen it with a spoonful of warm—not violently boiling—pasta water.

No cream or butter

Neither is needed for this selected Roman method. Starch, Pecorino and agitation make the sauce.

Troubleshooting

The cheese forms strings or lumps. The pasta or pan was too hot when Pecorino was added. Work off direct heat and cool briefly.
The sauce is watery. Too much pasta water was added at once. Keep tossing and add more cheese only if necessary.
The pasta is dry after plating. The emulsion was too tight before service. Finish slightly looser because it thickens on the plate.

Nutrition per serving

Serving size: 1 pasta course
Calories: approximately 610 kcal
Carbohydrates: 76 g
Protein: 26 g
Fat: 22 g
Fibre: 3 g
Sodium: approximately 950 mg

Estimate depends strongly on Pecorino sodium and how much salt is used in the pasta water.

Allergens and food safety

Contains wheat/gluten and milk.

Use clean utensils for the cheese mixture and serve promptly rather than holding the warm dairy sauce for extended periods.

Refrigerate leftovers within 2 hours and reheat to 74 °C, although the emulsion is best freshly made.

FAQ

Why does cacio e pepe clump?

Pecorino proteins tighten when exposed to excessive heat. Lower temperature and starch-rich water are the main controls.

Can Parmesan replace Pecorino Romano?

It melts differently and changes the sharp sheep’s-milk character; it is a variation rather than the selected Roman formula.

Is tonnarelli traditional for cacio e pepe?

Yes as a well-established Roman variation, even though the Turismo Roma reference recipe is written for spaghetti.

Final note

What matters most

Result: Thick tonnarelli coated in a glossy Pecorino emulsion, punctuated by aromatic black pepper with no cream masking the cheese.
Key: Control heat before Pecorino enters and use starchy water gradually.