Why blanch the fennel?
Large fennel bulbs can be surprisingly fibrous. Sautéing makes them sweeter, but it doesn’t always make them tender—at least not before the rest of the dish is overcooked.
A brief blanch changes that. Three or four minutes in boiling salted water relaxes the fibers while preserving the fennel’s sweetness and delicate anise aroma. It’s a simple restaurant technique that rarely appears in home recipes, but here it transforms the fennel from a stubborn supporting ingredient into the quiet star of the dish.
Keep the fennel water
Once the fennel is tender, lift it from the pot with a slotted spoon or spider, but don’t pour the water down the drain. Bring it back to a boil and use it to cook the orecchiette.
The effect is subtle. The pasta won’t taste obviously of fennel, but the water carries a faint sweetness and perfume into the pasta. That background flavor quietly reinforces the fennel in the pan, the fennel seed in the sausage and the fresh fronds added at the end.
Give the pasta some room
A pound of orecchiette should be cooked in about 6 quarts of water. That may sound excessive, but these little ears have an annoying tendency to nest inside one another. When that happens, the exposed pieces cook while those trapped inside remain stubbornly hard.
A large pot of vigorously boiling water gives them room to circulate. Stir especially well during the first few minutes, when the surface starch is most likely to glue them together.
Not all orecchiette are alike
The pasta itself can change the dish more than you might expect.
The last time I made this, I used Barilla Al Bronzo, the company’s premium bronze-cut line. Its rough surface held the sauce beautifully, but the orecchiette remained surprisingly tough even after cooking beyond the time suggested on the package. There’s a difference between pleasantly al dente and pasta that seems determined to fight back along with the fennel.
For orecchiette, I prefer De Cecco. It still has enough surface texture to catch the sauce, but it cooks more evenly and becomes tender without losing the firmness that gives the little ears their character.
Whatever brand you use, treat the package time as a suggestion. Orecchiette are thinner at the edges and considerably thicker in the center. Taste several pieces and judge the middle, not merely the rim.