Grana Padano is a hard cow's-milk grating cheese from a wide area of northern Italy. It belongs to the same family as Parmigiano-Reggiano, and it is a protected cheese.
The zone is larger, the rules on feed and age are not the same, and the flavor is often milder. Use it the way you use Parmesan: in shards, or grated at the end of cooking.
History
Grana means grain, the fine cooked curd of these hard cheeses. The style grew up across the Po valley, where monasteries and later large dairies turned abundant cow's milk into wheels that could be stored. Padano refers to that valley of the Po, not to a single town.
The protected zone today is much wider than the zone for Parmigiano-Reggiano. It stretches across much of northern Italy. The two cheeses share a medieval family and a modern kitchen role. They were divided so that each set of dairies could keep its own rules. Grana Padano is not a failed Parmesan. It is the other great grana.
How it is made
Cow's milk is partly skimmed, the curd is cut fine and cooked, and the cheese is pressed into large wheels, salted, and aged. The outline matches Parmigiano-Reggiano. The details do not. The feed rules are looser, the production zone is larger, and the typical wheel is often younger and milder. Many wheels are still aged until they are firm grating cheeses.
Age still matters inside the name. A younger Grana Padano is more supple and milky. An older one, sometimes sold as riserva, is drier and closer in use to an aged Parmesan. The label's age, when it is given, tells you more than the shared family name. Crystals in an older wheel are a sign of time, as they are in other long-aged granas.
Taste
The taste is savory, nutty, and salty, with a grainy break. Compared with Parmigiano-Reggiano of a similar age, Grana Padano is often gentler and a little sweeter, with less of the deep broth note. That mildness is why many Italian kitchens grate it every day.
A tired, pre-grated tub tastes dusty. A fresh shard smells of nuts and broth. Bitterness or a rancid oil smell is a storage fault. The paste should look pale straw to gold, not grey. If it tastes of nothing, it was grated too long ago, or it was a very young cheese asked to do an old cheese's work.
In the kitchen
Finish pasta, risotto, polenta, and vegetables with it. Eat a younger piece as a table cheese, with fruit or bread. Use an older piece when you want more intensity from a smaller amount. The rind can flavor a pot of soup, as a Parmesan rind does.
Swap it for Parmigiano-Reggiano in most cooking without changing the shape of the dish. Taste and add a little more if the recipe counted on a stronger wheel. Do not swap it for Pecorino Romano in cacio e pepe and expect the same sharp sheep salt. Do not buy it for a cheese that must stretch. It softens under heat. It does not become a string.
Around the world
Grana Padano is made across its northern Italian zone and exported widely. In Italy it is often the everyday grating cheese, while a special meal might bring out an older Parmigiano-Reggiano. Abroad, shoppers sometimes buy it because it costs less than Parmesan and still belongs to the same family. That is a sound reason.
The name is protected. A wheel labeled Grana Padano is the cheese of that zone, not a generic hard cheese. Other countries make grana-style cheeses and should say so plainly. When a recipe says Grana Padano, a Parmesan wedge is a fair substitute. When a recipe says Parmesan and you have Grana Padano, the dish will usually succeed, with a milder finish.