Most seeds come from fruit that naturally free themselves from the shell, but this is not the case in nuts such as hazelnuts, chestnuts, and acorns, which have hard shell walls and originate from a compound ovary. The general and original usage of the term is less restrictive, and many nuts (in the culinary sense), such as almonds, pistachios, and Brazil nuts, are not nuts in a botanical sense. Common usage of the term often refers to any hard-walled, edible kernel as a nut. Nuts are an energy-dense and nutrient-rich food source.

Botanically, a nut is a fruit with a woody pericarp developing from a syncarpous gynoecium. True nuts include, for example, chestnut, hazelnut and filbert. Culinarily, the term 'nut' is used much more widely, and includes examples of drupes (such as pecans and almonds) or seeds (such as pine nuts and peanuts).

Also widely known as nuts are dry drupes, which include pecans, almonds, macadamia (Macadamia integrifolia), candlenut (Aleurites moluccanus) and the water caltrop (Trapa bicornis). A drupe is an indehiscent fruit that has an outer fleshy part consisting of the exocarp, or skin, and mesocarp, or flesh, which surround a single pit or stone, the endocarp with a seed (kernel) inside. In a dry drupe, the outer parts dry up and the remaining husk is part of the ovary wall or pericarp, and the hard inner wall surrounding the seed represents the inner part of the pericarp.

Walnuts and hickories (Juglandaceae) have fruit that are difficult to classify. They are considered to be nuts under some definitions but are also referred to as drupaceous nuts.

In common use, a "tree nut" is, as the name implies, any nut coming from a tree. This most often comes up regarding food allergies; a person may be allergic specifically to peanuts (which are not tree nuts but legumes), whereas others may be allergic to the wider range of nuts that grow on trees.

The sweet potato arrived in Europe with the Columbian exchange. It is recorded, for example, in Elinor Fettiplace's Receipt Book, compiled in England in 1604.

Nuts are eaten by humans and wildlife. Because nuts generally have a high oil content, they are a significant energy source. Many seeds are edible by humans and used in cooking, eaten raw, sprouted, or roasted as a snack food, ground to make nut butters, or pressed for oil that is used in cooking and cosmetics.

Nuts used for food are a common source of food allergens. Reactions can range from mild symptoms to severe ones, a condition known as anaphylaxis, which can be life-threatening. The reaction is due to the release of histamine by the body in response to an allergen in the nuts, causing skin and other possible reactions. Many experts suggest that a person with an allergy to peanuts should avoid eating tree nuts, and vice versa.

The nuts linked to from this page are: acorn; almond; beech nuts; betel nut; brazil nut; bush mango; filbert; ginkgo nut; kola nut; candlenut; cashew; chestnut; coconut; hazelnut; macadamia; ogbono; palm nut; peanut; pecan; pine nut; pistachio; walnut.

The alphabetical list of all the nut-based recipes on this site follows, (limited to 100 recipes per page). There are 4553 recipes in total:

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Ogbono Soup with Waterleaf      Origin: Nigeria	Orecchiette with Mushroom Sauce      Origin: Italy	Padipe Saasmi (Utupi-style Red Amaranth Leaf Curry)      Origin: India
Ohn Htamin (Burmese Coconut Rice)      Origin: Myanmar	Orehnjaca (Walnut Roll)      Origin: Croatia	Pado'lalo' (Spicy coconut Aubergine)      Origin: Guam
Ohn-No Khaukswe (Coconut Noodles)      Origin: Myanmar	Orenau wedi Llenwi (Stuffed Oranges)      Origin: Welsh	Pado'lalo' (Spicy coconut Aubergine)      Origin: Northern Mariana Islands
Oil-based Flapjacks      Origin: Britain	Oriental Chicken with Broccoli      Origin: Fusion	Pahua au curry (Curried Pahua)      Origin: Tahiti
Oka Popo (Samoan Raw Fish)      Origin: American Samoa	Orikhova Masa (Walnut Filling)      Origin: Georgia	Pahua Taioro      Origin: Tahiti
Oka Popo (Samoan Raw Fish)      Origin: Samoa	Orugli Vesak (Lemony Sponge Cake Dessert)      Origin: Croatia	Paifala (Pineapple and Coconut Pasties)      Origin: American Samoa
Okok (Eru Leaf Stew)      Origin: Cameroon	Otak-otak (Spicy Grilled Nyonya Fish Cakes)      Origin: Malaysia	Pakistani Chicken Biryani      Origin: Pakistan
Okpa (Bambara Groundnut Breakfast Pudding)      Origin: Nigeria	Ottogi Karē (Ottogi Curry)      Origin: Korea	Palandi      Origin: Sri Lanka
Okra Relish      Origin: Tanzania	Oude Sauce      Origin: Britain	Palandy      Origin: Sri Lanka
Olan      Origin: India	Overnight Oats      Origin: Britain	Palauan Fish Soup      Origin: Palau
Old Bay Seasoning Mix      Origin: American	Ox-heart Black Curry      Origin: Sri Lanka	Palaver 'Sauce'      Origin: West Africa
Old Fashioned Carrot Pudding      Origin: Britain	Oxeye Daisy Chopsuey      Origin: Fusion	Palaver Chicken      Origin: Ghana
Olio di Peperoncino (Chilli Oil)      Origin: Italy	Oxeye Daisy Filo Rolls      Origin: Fusion	Palestine Soup      Origin: British
Oluwombo      Origin: Uganda	Oxeye Daisy Pesto      Origin: Britain	Palestinian Meat Stuffing      Origin: Palestine
Omajova-Pilz-Ragout mit Hirse (Omajova Mushroom Ragout with Millet)      Origin: Namibia	Oxford Sausages      Origin: England	Palm Soup Base #2      Origin: Liberia
Oman Baharat      Origin: Oman	Oyster Forcemeat      Origin: British	Palusami      Origin: American Samoa
Ombidi (Namibian Spinach Stew)      Origin: Namibia	Oyster Soup      Origin: British	Palusami      Origin: Fiji
Onion Sauce      Origin: Britain	Oysters Fried in Batter      Origin: British	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Kiribati
Opor Ayam (Java Chicken Curry)      Origin: Indonesia	Pâté Nadolig (Christmas Pâté)      Origin: Welsh	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Marshall Islands
Opor Ayam Jawa (Javanese Coconut Curry Chicke)      Origin: Indonesia	Pâte Folle (French Almond Pastry)      Origin: France	Palusami (Coconut Cream and Tinned Meat in Taro Leaves)      Origin: Nauru
Orange and Pomegranate Cake      Origin: Britain	Pâtes 'Teuf-Teuf' (Pasta 'Teuf-Teuf')      Origin: Mali	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Solomon Islands
Orange and Walnut Blintzes      Origin: American	Pão de mel (Honey Loaf)      Origin: Mozambique	Palusami      Origin: Samoa
Orange Bergamot Nuts      Origin: American	Pè Thee Thoke (String Bean Salad)      Origin: Myanmar	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Samoa
Orange Crumble Mince Pies      Origin: Britain	Pèpè Soup du Cameroun (Cameroonian Pepper Soup)      Origin: Cameroon	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Tuvalu
Orange Haystacks      Origin: American	Paalag Gosht (Mughlai Lamb with Spinach)      Origin: India	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Tuvalu
Orange Mincemeat      Origin: Britain	Paasbrod (Dutch Easter Bread)      Origin: Netherlands	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Wallis Futuna
Orange Olive Oil Cake      Origin: Fusion	Pacific-style Coconut Rice      Origin: Hawaii	Palusami II      Origin: Kiribati
Orange Walnut Muffins      Origin: British	Pacific-style Coconut Rice      Origin: Kiribati	Pamplona de Puerco (Barbecued Stuffed, Rolled Pork)      Origin: Uruguay
Oranges Douces de Congo (Sweet Congolese Oranges)      Origin: Congo	Pad Gra Prow (Holy Basil Beef)      Origin: Thailand	Pampoenkokies (Christmas Fruit Fritters)      Origin: South Africa
Oranges in Syrup      Origin: Britain	Pad Kee Mao      Origin: Thailand	Pan Haggis      Origin: Scotland
Orašnice (Walnut Biscuits)      Origin: Bosnia	Pad Krapow Gai (Spicy Basil Chicken)      Origin: Thailand	Pan Puddings      Origin: Scotland
Orašnice (Walnut Biscuits)      Origin: Croatia	Pad See Ew (Stir-fried Pork with Noodles and Broccoli)      Origin: Thailand	Pan-fried Megrim Sole with Creamed Spinach      Origin: Britain
Orašnice (Walnut Biscuits)      Origin: Macedonia	Pad Thai      Origin: Thailand
Orašnice (Walnut Biscuits)      Origin: Serbia	Padavalanga Parippu Curry (Snake Gourd Curry)      Origin: India

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