Technique · Making
The egg-to-flour ratio
The Bolognese standard for tagliatelle is a single ratio that has not changed in living memory: one whole egg per 100 grams of tipo 00 flour. The number assumes an Italian medium egg of 50 to 55 grams. Departures from the ratio — yolks only, added spinach, larger eggs — require small but specific adjustments.
The standard ratio
One egg per 100 grams of flour, by count. For four servings of tagliatelle, four eggs and 400 g of tipo 00. For six servings, six and 600. For a single person, in practice, you start at two and 200 — the dough is easier to work in larger quantities and any extra is wrapped, refrigerated, and rolled within 24 hours, or formed into nidi and frozen.
The ratio is by count, but it implicitly assumes the Italian uovo medio — the medium egg. Italian eggs are graded by weight: S (small, < 53 g), M (medium, 53–63 g), L (large, 63–73 g), XL (very large, > 73 g). The standard medium runs around 55 g in shell, 50 g out. The 1 : 100 ratio assumes this size.
Outside Italy egg sizes can differ. American "large" eggs are typically 56–63 g (close enough to Italian medium for the ratio to hold). British "large" eggs are 63–73 g and are too big — with British large eggs, three for 400 g of flour is closer to the Italian standard than four. If precision matters — and for fresh pasta, it does — weigh the eggs after cracking them and treat the ratio as 200 g of egg per 400 g of flour: roughly 50 per cent of the flour weight in egg by mass.
How the ratio works in the dough
The 1 : 100 ratio produces a dough that is moist enough to come together in 8 to 10 minutes of kneading, dry enough to roll thin without sticking, and elastic enough to take a sheet that does not tear at mattarello pressure. Decrease the egg (less than one per 100 g) and the dough crumbles dry. Increase it substantially and the dough becomes sticky and the sheet will tear; small increases (up to about 1.2 : 100) give a slightly richer, slightly softer pasta but compromise the rolling.
A dough at the standard ratio looks, after kneading, like a smooth yellow ball with a faint sheen. It should hold its shape when set down. Pressed with a finger, it should yield slowly and rebound slowly — not bounce back like rubber, but not stay deformed. A dough that is too wet glistens and feels slightly tacky to the touch; correct with a tablespoon of flour, kneaded in. A dough that is too dry has visible flour streaks and resists coming together; correct with a few drops of water, worked in.
Yolks only: the tajarin variant
The Piedmontese tajarin dough uses egg yolks only, not whole eggs. The classical proportion is up to 30 yolks per kilogram of flour, or about three yolks per 100 g. A yolk weighs roughly 17 to 20 g; thirty yolks is around 600 g of yolk per kilogram of flour — a much richer and richer-coloured dough than whole-egg tagliatelle.
The all-yolk dough has higher fat content (yolks are about 27 % fat) and less water than a whole-egg dough; it is correspondingly more tender, more delicate, and more fragile. It produces the deep yellow that distinguishes tajarin from ordinary tagliolini — a colour saturated enough to seem almost orange when fresh. The trade-off: the dough is less elastic, the sheet tears more easily, and the pasta keeps less well. In Piedmont, tajarin is rolled, cut, and eaten the same day; refrigerator storage is brief; freezing is acceptable but the texture suffers slightly more than whole-egg tagliatelle.
Less extreme yolk-rich variants exist between the whole-egg and the all-yolk pole. Some Emilian cooks add one or two extra yolks per 400 g of flour to a four-whole-egg base — intermediate enrichment for a more luxurious tagliatella. The principle is the same as in pastry: yolks deepen colour, soften texture, add richness; whites add structure and water.
Green pasta: the spinach adjustment
For tagliatelle verdi, the dough incorporates blanched, drained, very finely chopped spinach — typically 100 g of cooked spinach per 400 g of flour. The spinach is wet, so the egg count is reduced by one: three whole eggs plus 100 g spinach for 400 g flour, instead of four whole eggs plain.
The principle generalises. Any wet ingredient added to the dough — spinach, chard, nettle paste, beetroot purée, tomato concentrate — replaces some of the egg's contribution by mass. The standard rule of thumb: every 50 g of well-squeezed wet purée added subtracts one whole egg (roughly 50 g) from the count. The exact balance varies with how thoroughly the wet ingredient has been drained; a slightly wetter dough can be corrected with a tablespoon of flour during kneading.
What changes the ratio is not
Several things sometimes added to fresh pasta doughs by non-Italian recipes are, in the strict Bolognese reading, departures from the standard rather than versions of it:
- Olive oil. Adds fat and changes the texture; not classical for tagliatelle. Some Roman fettuccine recipes include a teaspoon; Bolognese cooks generally do not.
- Water. Used to extend the dough when the egg supply is short. Produces a less tender, more elastic pasta closer to southern pasta di semola. Not classical.
- Salt. Adds flavour at the dough stage. Some sources tolerate a pinch; the strict Bolognese tradition does not. The cooking water will salt the pasta.
- Milk. Found in some old Emilian recipes for stuffed pasta doughs; not for plain tagliatelle.
None of these is wrong in an absolute sense, but they are variations from the standard, not the standard. The 1 : 100 ratio of flour and whole egg, alone, is the canonical Bolognese tagliatella.