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 3996 recipes in total:

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Oka Popo (Samoan Raw Fish)      Origin: Samoa	Orugli Vesak (Lemony Sponge Cake Dessert)      Origin: Croatia	Palaver 'Sauce'      Origin: West Africa
Oka Popo (Samoan Raw Fish)      Origin: American Samoa	Otak-otak (Spicy Grilled Nyonya Fish Cakes)      Origin: Malaysia	Palaver Chicken      Origin: Ghana
Okok (Eru Leaf Stew)      Origin: Cameroon	Ottogi Karē (Ottogi Curry)      Origin: Korea	Palm Soup Base #2      Origin: Liberia
Okpa (Bambara Groundnut Breakfast Pudding)      Origin: Nigeria	Oude Sauce      Origin: Britain	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Solomon Islands
Okra Relish      Origin: Tanzania	Overnight Oats      Origin: Britain	Palusami      Origin: Fiji
Olan      Origin: India	Ox-heart Black Curry      Origin: Sri Lanka	Palusami (Coconut Cream and Tinned Meat in Taro Leaves)      Origin: Nauru
Old Bay Seasoning Mix      Origin: American	Oxeye Daisy Chopsuey      Origin: Fusion	Palusami      Origin: Samoa
Old Fashioned Carrot Pudding      Origin: Britain	Oxeye Daisy Filo Rolls      Origin: Fusion	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Samoa
Olio di Peperoncino (Chilli Oil)      Origin: Italy	Oxeye Daisy Pesto      Origin: Britain	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Tuvalu
Oluwombo      Origin: Uganda	Oxford Sausages      Origin: England	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Tuvalu
Omajova-Pilz-Ragout mit Hirse (Omajova Mushroom Ragout with Millet)      Origin: Namibia	Pâté Nadolig (Christmas Pâté)      Origin: Welsh	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Kiribati
Oman Baharat      Origin: Oman	Pâtes 'Teuf-Teuf' (Pasta 'Teuf-Teuf')      Origin: Mali	Palusami      Origin: American Samoa
Ombidi (Namibian Spinach Stew)      Origin: Namibia	Pão de mel (Honey Loaf)      Origin: Mozambique	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Wallis Futuna
Onion Sauce      Origin: Britain	Pè Thee Thoke (String Bean Salad)      Origin: Myanmar	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Marshall Islands
Opor Ayam (Java Chicken Curry)      Origin: Indonesia	Pèpè Soup du Cameroun (Cameroonian Pepper Soup)      Origin: Cameroon	Palusami II      Origin: Kiribati
Opor Ayam Jawa (Javanese Coconut Curry Chicke)      Origin: Indonesia	Paalag Gosht (Mughlai Lamb with Spinach)      Origin: India	Pamplona de Puerco (Barbecued Stuffed, Rolled Pork)      Origin: Uruguay
Orange and Pomegranate Cake      Origin: Britain	Paasbrod (Dutch Easter Bread)      Origin: Netherlands	Pampoenkokies (Christmas Fruit Fritters)      Origin: South Africa
Orange and Walnut Blintzes      Origin: American	Pacific-style Coconut Rice      Origin: Kiribati	Pan Haggis      Origin: Scotland
Orange Bergamot Nuts      Origin: American	Pacific-style Coconut Rice      Origin: Hawaii	Pan Puddings      Origin: Scotland
Orange Crumble Mince Pies      Origin: Britain	Pad Gra Prow (Holy Basil Beef)      Origin: Thailand	Pan-fried Megrim Sole with Creamed Spinach      Origin: Britain
Orange Mincemeat      Origin: Britain	Pad Krapow Gai (Spicy Basil Chicken)      Origin: Thailand	Pan-fried Turbot with Summer Truffle Sauce      Origin: Britain
Orange Olive Oil Cake      Origin: Fusion	Pad See Ew (Stir-fried Pork with Noodles and Broccoli)      Origin: Thailand	Panang Curry Paste      Origin: Thailand
Orange Walnut Muffins      Origin: British	Pad Thai      Origin: Thailand	Pane della colomba di Pasqua (Italian Easter Dove Bread)      Origin: Italy
Oranges Douces de Congo (Sweet Congolese Oranges)      Origin: Congo	Padavalanga Parippu Curry (Snake Gourd Curry)      Origin: India	Paneer Butter Masala      Origin: India
Oranges in Syrup      Origin: Britain	Padipe Saasmi (Utupi-style Red Amaranth Leaf Curry)      Origin: India	Paneer Capsicum Curry      Origin: India
Orašnice (Walnut Biscuits)      Origin: Bosnia	Pado'lalo' (Spicy coconut Aubergine)      Origin: Guam	Paneer Kofta      Origin: India
Orašnice (Walnut Biscuits)      Origin: Serbia	Pado'lalo' (Spicy coconut Aubergine)      Origin: Northern Mariana Islands	Paneer Korma      Origin: Britain
Orašnice (Walnut Biscuits)      Origin: Croatia	Pahua au curry (Curried Pahua)      Origin: Tahiti	Paneer Lababdar      Origin: India
Orašnice (Walnut Biscuits)      Origin: Macedonia	Pahua Taioro      Origin: Tahiti	Paneer Lababdar      Origin: India
Orecchiette with Mushroom Sauce      Origin: Italy	Paifala (Pineapple and Coconut Pasties)      Origin: American Samoa	Paneer Makhani      Origin: India
Orehnjaca (Walnut Roll)      Origin: Croatia	Pakistani Chicken Biryani      Origin: Pakistan	Paneer Makhanwala      Origin: India
Orenau wedi Llenwi (Stuffed Oranges)      Origin: Welsh	Palandi      Origin: Sri Lanka	Paneer Maza (Chilli Paneer)      Origin: India
Oriental Chicken with Broccoli      Origin: Fusion	Palandy      Origin: Sri Lanka
Orikhova Masa (Walnut Filling)      Origin: Georgia	Palauan Fish Soup      Origin: Palau

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