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 3559 recipes in total:

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Nut-topped Sticky Toffee Pudding      Origin: Britain	Oluwombo      Origin: Uganda	Padavalanga Parippu Curry (Snake Gourd Curry)      Origin: India
Nutella Swirl Banana Muffins      Origin: Britain	Omajova-Pilz-Ragout mit Hirse (Omajova Mushroom Ragout with Millet)      Origin: Namibia	Padipe Saasmi (Utupi-style Red Amaranth Leaf Curry)      Origin: India
Nutty Fridge Cake      Origin: American	Oman Baharat      Origin: Oman	Pado'lalo' (Spicy coconut Aubergine)      Origin: Guam
Nutty Rice Burgers      Origin: Britain	Onion Sauce      Origin: British	Pado'lalo' (Spicy coconut Aubergine)      Origin: Northern Mariana Islands
Nyaba      Origin: Sudan	Opor Ayam (Java Chicken Curry)      Origin: Indonesia	Pahua au curry (Curried Pahua)      Origin: Tahiti
Nyeleng (Beef and Peanut Gumbo)      Origin: Senegal	Opor Ayam Jawa (Javanese Coconut Curry Chicke)      Origin: Indonesia	Pahua Taioro      Origin: Tahiti
Nyembwe Sauce      Origin: Gabon	Orange and Pomegranate Cake      Origin: Britain	Paifala (Pineapple and Coconut Pasties)      Origin: American Samoa
Nyete Greens with Peanut Butter      Origin: South Sudan	Orange and Walnut Blintzes      Origin: American	Pakistani Chicken Biryani      Origin: Pakistan
Nyona Penang Assam Laska      Origin: Malaysia	Orange Crumble Mince Pies      Origin: Britain	Palandi      Origin: Sri Lanka
Nyonya Curry Paste      Origin: Singapore	Orange Mincemeat      Origin: Britain	Palandy      Origin: Sri Lanka
Nyonya-style Curry with Eggs      Origin: Malaysia	Orange Olive Oil Cake      Origin: Fusion	Palauan Fish Soup      Origin: Palau
Nyponsoppa (Wild Rosehip Soup)      Origin: Sweden	Oranges in Syrup      Origin: Britain	Palaver 'Sauce'      Origin: West Africa
Oarweed Chips      Origin: British	Orecchiette with Mushroom Sauce      Origin: Italy	Palaver Chicken      Origin: Ghana
Oat Mittai with Fruit and Nuts      Origin: India	Orehnjaca (Walnut Roll)      Origin: Croatia	Palm Soup Base #2      Origin: Liberia
Oatmeal Bilberry Bread      Origin: Northern Ireland	Orenau wedi Llenwi (Stuffed Oranges)      Origin: Welsh	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Solomon Islands
Oatmeal Posset      Origin: Scotland	Oriental Chicken with Broccoli      Origin: Fusion	Palusami      Origin: Fiji
Obe Ata (Nigerian Pepper Soup)      Origin: Nigeria	Orikhova Masa (Walnut Filling)      Origin: Georgia	Palusami (Coconut Cream and Tinned Meat in Taro Leaves)      Origin: Nauru
Obe Eja Dindin (Fried Fish Stew)      Origin: Nigeria	Orugli Vesak (Lemony Sponge Cake Dessert)      Origin: Croatia	Palusami      Origin: Samoa
Obe Eja Tutu (Fresh Fish Stew)      Origin: Nigeria	Otak-otak (Spicy Grilled Nyonya Fish Cakes)      Origin: Malaysia	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Samoa
Ocopa de Camarones (Prawn Ocopa)      Origin: Peru	Ottogi Karē (Ottogi Curry)      Origin: Korea	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Tuvalu
Octopus Curry      Origin: Seychelles	Oude Sauce      Origin: British	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Tuvalu
Ofio Drink (Tiger Nut Drink)      Origin: Nigeria	Ox-heart Black Curry      Origin: Sri Lanka	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Kiribati
Ogbono Soup      Origin: Nigeria	Oxeye Daisy Chopsuey      Origin: Fusion	Palusami      Origin: American Samoa
Ogbono Soup with Ugwu      Origin: Nigeria	Oxford Sausages      Origin: England	Palusami (Coconut Cream and Onion in Taro Leaves)      Origin: Wallis Futuna
Ogbono Soup with Waterleaf      Origin: Nigeria	Pâté Nadolig (Christmas Pâté)      Origin: Welsh	Palusami (Corned Beef, Taro Greens and Coconut Milk)      Origin: Marshall Islands
Ohn Htamin (Burmese Coconut Rice)      Origin: Myanmar	Pâtes 'Teuf-Teuf' (Pasta 'Teuf-Teuf')      Origin: Mali	Pamplona de Puerco (Barbecued Stuffed, Rolled Pork)      Origin: Uruguay
Ohn-No Khaukswe (Coconut Noodles)      Origin: Myanmar	Pè Thee Thoke (String Bean Salad)      Origin: Myanmar	Pampoenkokies (Christmas Fruit Fritters)      Origin: South Africa
Oka Popo (Samoan Raw Fish)      Origin: Samoa	Paalag Gosht (Mughlai Lamb with Spinach)      Origin: India	Pan Haggis      Origin: Scotland
Oka Popo (Samoan Raw Fish)      Origin: American Samoa	Pacific-style Coconut Rice      Origin: Kiribati	Pan Puddings      Origin: Scotland
Okok (Eru Leaf Stew)      Origin: Cameroon	Pacific-style Coconut Rice      Origin: Hawaii	Pan-fried Megrim Sole with Creamed Spinach      Origin: Britain
Okpa (Bambara Groundnut Breakfast Pudding)      Origin: Nigeria	Pad Gra Prow (Holy Basil Beef)      Origin: Thailand	Panang Curry Paste      Origin: Thailand
Olan      Origin: India	Pad Krapow Gai (Spicy Basil Chicken)      Origin: Thailand	Pane della colomba di Pasqua (Italian Easter Dove Bread)      Origin: Italy
Old Bay Seasoning Mix      Origin: American	Pad See Ew (Stir-fried Pork with Noodles and Broccoli)      Origin: Thailand
Olio di Peperoncino (Chilli Oil)      Origin: Italy	Pad Thai      Origin: Thailand

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