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 4197 recipes in total:

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Haselnußtorte (Hazelnut Torte)      Origin: Germany	Hidden Heart Valentine's Cake      Origin: Britain	Hot Caramel Apple Drink      Origin: American
Haselnuss Halbmonde (Hazelnut Crescent Biscuits)      Origin: Germany	High Dumpsy Dearie Jam      Origin: England	Hot Chocolate Fondants      Origin: Britain
Hashwe Stuffing      Origin: Arabia	Highland Toffee      Origin: Scotland	Hot Crab      Origin: British
Hastletes of Fruyt (Roast Fruit)      Origin: England	Highland Venison Casserole with Chestnuts      Origin: Scotland	Hot Cross Buns With Cream Cheese Frosting      Origin: Britain
Haupia (Hawaiian Coconut Pudding)      Origin: Hawaii	Himalayan Balsam Seed Curry      Origin: Fusion	Hot Wings in Haw Sauce      Origin: Britain
Havuçlu Toplar (Turkish Carrot Balls)      Origin: Turkey	Hindle Wakes      Origin: England	Houska (Bohemian Sweet Bread)      Origin: Czech
Hawayij (Yemeni Spice Mix)      Origin: Yemen	Hoenderpastei (South African Chicken Pie)      Origin: South Africa	Houska (Bohemian Easter and Christmas Cake)      Origin: Czech
Hawthorn and Nut Autumn Biscuits      Origin: Britain	Hogmanay Whisky Cake      Origin: Scotland	Howtowdie      Origin: Scotland
Hazelnut and Cowberry Cake      Origin: Canada	Hoisin chicken with Noodles      Origin: Fusion	Howtowdie Stuffing      Origin: Scotland
Hazelnut and Garlic Mustard Pesto      Origin: Britain	Hoisin Pork with Garlic Noodles      Origin: China	Hummingbird Cake      Origin: American
Hazelnut and Wild Greens Pesto      Origin: Britain	Hoisin Sauce      Origin: China	Huni Roshi (Coconut Flatbread)      Origin: Maldives
Hazelnut Brittle      Origin: Britain	Holiday Eggnog Cheesecake      Origin: American	Hypocras      Origin: France
Hazelnut Clusters      Origin: Britain	Home-made Instant Pistachio Pudding Mix      Origin: American	Hypotrimma (Condiment Sauce)      Origin: Roman
Hazelnut crêpes with caramelised bananas      Origin: Britain	Home-made Instant Pistachio Pudding Mix      Origin: American	Iakwe Stew (Marshallese Chicken Stew)      Origin: Marshall Islands
Hazelnut Crescents      Origin: Turkmenistan	Home-made Sichuan Garlic Chilli Oil      Origin: China	Iced Coconut Soup      Origin: Cayman Islands
Hazelnut Cupcakes      Origin: Britain	Home-made Vegan Butter      Origin: Britain	Iced Curry Soup      Origin: Britain
Hazelnut Halva      Origin: Fusion	Honduran Yucca Cake with Sweet Milk Sauce      Origin: Honduras	Idichakka Thoran (Raw Jackfruit Curry)      Origin: India
Hazelnut Meringue      Origin: British	Honey Almond Brittle      Origin: Britain	Ifisashi (Bean Leaves with Peanuts)      Origin: Zambia
Hazelnut Milk      Origin: Britain	Honey and Catkin Grain Biscuits      Origin: Britain	Iflaghun      Origin: Syria
Hazelnut Nougat      Origin: Britain	Honey and Spice Buns      Origin: Britain	Igbekere (Plantain Chips)      Origin: Nigeria
Hazelnut Pancakes      Origin: Britain	Honey Fungus Tart      Origin: Britain	Igbo MoinMoin      Origin: Nigeria
Hearty Hogmanay Tart      Origin: Scotland	Honey Orange Koskosi      Origin: Egypt	Ignames à la Tomate (Yams with Tomatoes)      Origin: Burkina Faso
Heather Biscotti      Origin: Scotland	Honey Pecan Cupcakes      Origin: Canada	Igra Stobá (Liver Stew)      Origin: Bonaire
Hebridean Carrageen Pudding with Rose Water and Cardamom      Origin: Scotland	Honey Wafers      Origin: American	Igra Stobá (Liver Stew)      Origin: Curacao
Hedgehog Fungus Risotto      Origin: Britain	Honey-roasted Sea Lettuce      Origin: Britain	Ika Lolo (Fish in Taro Leaves)      Origin: Tonga
Hedgerow Jam      Origin: British	Hong am Rèisleck (Chicken Cooked in Wine)      Origin: Luxembourg	In Aprum Assum Iura Ferventia Facies Sic (Hot Sauce for Roast Wild Boar is Made Thus)      Origin: Roman
Hedgerow Salad      Origin: Ancient	Hong Shao Rou (Red-braised pork belly)      Origin: Britain	In Lolligine Farsili (Stuffed Squid)      Origin: Roman
Helado de Boletus Edulis con Crema de Clitocybe Odora (Penny Bun Ice Cream with Aniseed Toadstool Cream)      Origin: Spain	Hor Mok Pla Chawnn Bai-Yaw (Steamed Serpent Head Fish Curry with Indian Mulberry Leaf)      Origin: Thailand	In ovis hapalis (Boiled Eggs and Pine-nuts)      Origin: Roman
Hena-Kisoa sy voanjobory (Pork with Bambara Groundnuts)      Origin: Madagascar	Hor Mok Pla Chawnn Bai-Yaw (Steamed Serpent Head Fish Curry with Indian Mulberry Leaf)      Origin: Thailand	In Ovis Hapalis (Of Soft-boiled Eggs)      Origin: Roman
Henan Hu La Tang (Hot Pepper Soup)      Origin: China	Horchata (Chilled Almond Drink)      Origin: Spain	In Piscibum Elixis (Of Poached Fish)      Origin: Roman
Herb Flower Pesto      Origin: Britain	Horchata      Origin: Mexico	In Sardis (Sauce for Bonito)      Origin: Roman
Herbae Rusticae (Country Herbs)      Origin: Roman	Horchata de Chufas (Tiger Nut Milk)      Origin: Spain	Inafliton Lemai (Fried Breadfruit Slices)      Origin: Comoros
Herodotus' Pudding      Origin: Britain	Hot and Sour Soup      Origin: China
Hertzoggies      Origin: South Africa	Hot Buttered Rum      Origin: Britain

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