corn Zea mays, Gramineae
Probably originating from Mexico or Central America, corn is sometimes also called "Indian wheat." The corn kernels grow on
ears that are 6-12 in. (15-30 cm) long. They are yellow, white, orange, red, purple, blue, black or brown, depending on the variety.
The kernel comprises three main parts: the pericarp (envelope), the endosperm (contains 90% starch) and the embryo (the germ, rich in nutrients). Corn species are grouped into six categories. The most important species commercially is used to feed animals, and is referred to as dent corn. The second most important species is the sweetcorn used for human consumption; the kernels are tender, milky and sweet. Among the other varieties are popping corn or "popcorn"; this is a variety with small kernels. There is also ornamental corn, which is not edible. Depending on the species, the kernels are more or less sweet, oily and tasty.
Buying
Choose: very fresh corn that releases white juice under simple finger pressure.
Avoid: colorless or shrivelled corn, whose silky threads are dark and dry, or whose husk leaves are faded or yellowed. Don't buy corn from displays that are exposed to sunlight or high temperatures, as heat accelerates the process that makes corn floury.
Serving Ideas
Fresh corn is eaten cooked as is on the cob, or the kernels are removed, then cooked and eaten.
Corn on the cob is often seasoned with butter and salt.
Corn kernels can be removed from the cob before or after cooking. Raw corn kernels are used in soups, stews and relishes. Cooked kernels are served as a side dish or added to salads.
Hominy is made by soaking corn kernels in lye to remove the hulls; hominy is soft and creamy, and slightly puffy, and is used as a side dish or in casseroles and stews. Pozole is the Mexican name for hominy, and is available fresh or dried.
Hominy grits are ground dried hominy, eaten as a porridge but more commonly as a side to eggs and bacon.
The fine corn flour called masa harina is milled from dried hulled corn kernels that have been soaked and kneaded into dough, then dried and ground to make tortillas.
Cornstarch is obtained by extracting the starch from the endosperm. It has gelling properties and is used in the same way as wheat flour or to thicken foods. Before adding cornstarch to a hot mixture, blend it with some cold liquid to prevent it from forming lumps.
Cook it for at least 1 min. The food industry uses this starch to thicken sauces, desserts, pastries, vinaigrettes, sour cream, peanut butter, confectionery, baby foods, charcuterie (sausages and deli meats), etc. The starch can be processed to control its effect. It is called "modified starch."
Cornmeal is obtained by milling degermed and dried corn kernels into more or less fine granules. It gives a slightly crunchy texture to cookies, muffins, cakes, breads. It is boiled into a thickened porridge to make polenta; it is added to and thickens soups and sauces, and is made into tamales—a meat-filled corn "roll" baked in a corn husk— tortillas and corn chips. It is difficult to knead and results in a crumbly product.
Corn flour results from the finest milling of the dried corn kernel, from which the germ is often removed. It is used in crepes, cakes, muffins and breads. As it is gluten-deficient, it must be combined with wheat flour to obtain foods that will rise (cakes, muffins, breads).
The corn germ is the embryo; it contains several nutrients and 46% of its calories comes from its fats. The germ is almost always removed from the kernels so that the products made from corn keep for a longer time. The corn germ has a crunchy texture and a nutty flavor. It is used by itself with milk as a cold cereal, added to foods to enrich them (salads, legumes, simmered dishes). Highly perishable, it is often sold in airtight packaging that is stored in the fridge or freezer once opened.
Corn oil is dark gold when unrefined and pale amber when it is refined. It contains polyunsaturated fatty acids (58.7%), monounsaturated fatty acids (24.2%) and saturated fatty acids (12.7%).
Cornflakes are ready-to-eat cold cereal.
Corn is used in the manufacture of beer, bourbon (whiskey), gin and chicha (an indigenous South American drink made from fermented corn sprouts).
Nutritional Information
| fresh, cooked | creamed | cornmeal (whole grain) | cornmeal (de-germed) | corn flour (whole grain) | bran |
| water | 69.6% | 78.7% | 10.3% | 11.6% | 10.9% | 4.8% |
| protein | 3.3 g | 1.7 g | 8.1 g | 8.5 g | 6.9 g | 2.5 g |
| fat | 1.3 g | 0.4 g | 3.6 g | 1.6 g | 3.9 g | 0.2 g |
| carbohydrates | 25.1 g | 18.1 g | 76.9 g | 77.7 g | 76.8 g | 25.7 g |
| fiber | 3.7 g | 1.3 g | 11.0 g | 5.2 g | 13.4 g | 25.4 g |
| calories | 108 | 72 | 362 | 366 | 361 | 67.2 |
| | | | per 3.5 oz/100 g | per 1 oz/30 g |
Corn is mainly made up of polyunsaturated fatty acids (46%), monounsaturated fatty acids (28%) and saturated fatty acids (15%). The floury varieties are higher in starch, which results in kernels that are not very sweet. In the sweeter varieties, the sugar begins to turn into starch as soon as it is picked, quickly resulting in a loss in flavor.
Fresh cooked corn
Good source: folic acid, potassium
and thiamine.
Contains: magnesium, pantothenic acid, vitamin C, phosphorus, niacin, zinc
and riboflavin.
Rich source of fiber.
Creamed corn
Good source: folic acid.
Contains: potassium, vitamin C, magnesium, zinc, niacin and phosphorus.
yellow cornmeal (whole grain)
Excellent source: magnesium, thiamine, iron and potassium.
Good source: phosphorus, zinc, niacin and vitamin B6.
Contains: riboflavin, folic acid, copper, pantothenic acid and vitamin A.
Very rich source of fiber.
cornmeal (degermed)
Good source: folacin and magnesium.
Contains: vitamin B6, potassium, niacin, thiamine, zinc, iron and phosphorus.
corn flour (whole grain)
Excellent source: magnesium, potassium and phosphorus.
Good source: vitamin B6, thiamine, zinc
and iron.
Contains: niacin, copper, folic acid, pantothenic acid, riboflavin and vitamin A.
Very rich source of fiber.
Corn bran
Contains: magnesium and iron.
Very rich source of fiber.
Corn germ
Excellent source: magnesium, phosphorus, thiamine, potassium and zinc.
Good source: vitamin B6 and iron.
Contains: riboflavin, folic acid and copper.
Fresh corn, boiled or dried, is deficient in lysine and tryptophan, the amino acids that make up proteins. It is the only cereal that contains vitamin A (yellow varieties). People who get almost all their nutrients from corn often suffer from a niacin deficiency.
Cooking
Ears of corn are cooked with or without their leaves.
Baked or grilled: wrap husked corn in aluminum foil (35 min at 425°F/220°C).
Steamed: 20 min. Avoid salting or overcooking corn, as it toughens and
loses flavor.
Boiled: immerse the ears in boiling water to which a very small amount of sugar has been added, leaving on a few leaves from the husk and adding a little milk or beer (3-4 min for small ears and 5-7 min for larger ones).
Pressure-cooked: in 1 cup (250 ml) of liquid (3-5 min).
Microwaved: 3 min on the highest setting for 1 ear. Let stand for 5 min.
Storing
Eat fresh corn as soon as possible, preferably on the same day as it
is bought.
At room temperature: keep cornmeal
and corn flour in a cool and dry place, in
airtight containers.
In the fridge: if eating at a later time. Do not remove the husks. If it is husked, keep in a plastic bag. Keep whole grain cornmeal and corn flour in airtight containers.
In the freezer: 1 year, blanch 7-11 min, depending on size; 3 months, blanch 4 min then remove the kernels. Whole grain cornmeal and corn flour keep 1-2 years.
Fresh corn can be canned.
fresh corn kernels
corn flakes
corn oil
dried kernels
cornmeal
corn flour
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