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 3912 recipes in total:

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Hedgehog Fungus Risotto      Origin: Britain	Hor Mok Pla Chawnn Bai-Yaw (Steamed Serpent Head Fish Curry with Indian Mulberry Leaf)      Origin: Thailand	In Sardis (Sauce for Bonito)      Origin: Roman
Hedgerow Salad      Origin: Ancient	Hor Mok Pla Chawnn Bai-Yaw (Steamed Serpent Head Fish Curry with Indian Mulberry Leaf)      Origin: Thailand	Inafliton Lemai (Fried Breadfruit Slices)      Origin: Comoros
Helado de Boletus Edulis con Crema de Clitocybe Odora (Penny Bun Ice Cream with Aniseed Toadstool Cream)      Origin: Spain	Horchata (Chilled Almond Drink)      Origin: Spain	Indian Curry Paste      Origin: Fusion
Hena-Kisoa sy voanjobory (Pork with Bambara Groundnuts)      Origin: Madagascar	Horchata de Chufas (Tiger Nut Milk)      Origin: Spain	Indian Dumpode Goose      Origin: Anglo-Indian
Henan Hu La Tang (Hot Pepper Soup)      Origin: China	Hot and Sour Soup      Origin: China	Indian-style pancakes with spiced Jersey Royals      Origin: Fusion
Herb Flower Pesto      Origin: Britain	Hot Buttered Rum      Origin: Britain	Indonesian Curry Spice Paste      Origin: Indonesia
Herbae Rusticae (Country Herbs)      Origin: Roman	Hot Caramel Apple Drink      Origin: American	Indonesian Peanut Sauce      Origin: Indonesia
Herodotus' Pudding      Origin: Britain	Hot Chocolate Fondants      Origin: Britain	Indonesian Soufflé Omelette      Origin: Indonesia
Hertzoggies      Origin: South Africa	Hot Cross Buns With Cream Cheese Frosting      Origin: Britain	Indonesian-style Spicy Cod      Origin: Fusion
Hidden Heart Valentine's Cake      Origin: Britain	Hot Wings in Haw Sauce      Origin: Britain	Injeolmi Bingsu (Korean Milk Ice Sorbet with Rice Cakes)      Origin: Korea
High Dumpsy Dearie Jam      Origin: England	Houska (Bohemian Sweet Bread)      Origin: Czech	Insal Nga Lapu Lapu (Grilled Grouper with Aubergine-prune Compote)      Origin: Philippines
Highland Toffee      Origin: Scotland	Houska (Bohemian Easter and Christmas Cake)      Origin: Czech	Insalata di Riso (Rice Salad)      Origin: Italy
Highland Venison Casserole with Chestnuts      Origin: Scotland	Howtowdie      Origin: Scotland	Insanity Chilli Paste      Origin: Fusion
Himalayan Balsam Seed Curry      Origin: Fusion	Howtowdie Stuffing      Origin: Scotland	Iraqi Dolma      Origin: Iraq
Hindle Wakes      Origin: England	Hummingbird Cake      Origin: American	Irish Carbonnade      Origin: Ireland
Hoenderpastei (South African Chicken Pie)      Origin: South Africa	Huni Roshi (Coconut Flatbread)      Origin: Maldives	Irish Ginger Cake      Origin: Ireland
Hogmanay Whisky Cake      Origin: Scotland	Hypocras      Origin: France	Irish Plum Cake      Origin: Ireland
Hoisin chicken with Noodles      Origin: Fusion	Hypotrimma (Condiment Sauce)      Origin: Roman	Irish Potato Cake      Origin: Ireland
Hoisin Pork with Garlic Noodles      Origin: China	Iakwe Stew (Marshallese Chicken Stew)      Origin: Marshall Islands	Irish Potato Pancakes      Origin: Ireland
Hoisin Sauce      Origin: China	Iced Coconut Soup      Origin: Cayman Islands	Irish Rink Cake      Origin: Ireland
Holiday Eggnog Cheesecake      Origin: American	Iced Curry Soup      Origin: Britain	Irish Whiskey Syllabub      Origin: Ireland
Home-made Instant Pistachio Pudding Mix      Origin: American	Idichakka Thoran (Raw Jackfruit Curry)      Origin: India	Irmik Helvasi (Semolina Halva)      Origin: Turkey
Home-made Sichuan Garlic Chilli Oil      Origin: China	Ifisashi (Bean Leaves with Peanuts)      Origin: Zambia	Iron Age Pork and Beans      Origin: Ancient
Home-made Vegan Butter      Origin: Britain	Iflaghun      Origin: Syria	Isi Ewu (Spiced Goat Head)      Origin: Nigeria
Honduran Yucca Cake with Sweet Milk Sauce      Origin: Honduras	Igbekere (Plantain Chips)      Origin: Nigeria	Isicia ex Sphondylis (Mussel Forcemeat)      Origin: Roman
Honey Almond Brittle      Origin: Britain	Ignames à la Tomate (Yams with Tomatoes)      Origin: Burkina Faso	Isicia Ova et Cerebella (Egg and Brain Sausages)      Origin: Roman
Honey and Catkin Grain Biscuits      Origin: Britain	Igra Stobá (Liver Stew)      Origin: Bonaire	Islay Loaf      Origin: Scotland
Honey and Spice Buns      Origin: Britain	Igra Stobá (Liver Stew)      Origin: Curacao	Isombe      Origin: Rwanda
Honey Fungus Tart      Origin: Britain	Ika Lolo (Fish in Taro Leaves)      Origin: Tonga	Ispanaklı Kek (Spinach Cake)      Origin: Turkey
Honey Pecan Cupcakes      Origin: Canada	In Aprum Assum Iura Ferventia Facies Sic (Hot Sauce for Roast Wild Boar is Made Thus)      Origin: Roman	Italian Cake Christmas Pudding      Origin: Fusion
Honey Wafers      Origin: American	In Lolligine Farsili (Stuffed Squid)      Origin: Roman	Iumbolls      Origin: Britain
Honey-roasted Sea Lettuce      Origin: Britain	In ovis hapalis (Boiled Eggs and Pine-nuts)      Origin: Roman	Iura Ferventia in Cervo (Hot Sauce for Venison)      Origin: Roman
Hong am Rèisleck (Chicken Cooked in Wine)      Origin: Luxembourg	In Ovis Hapalis (Of Soft-boiled Eggs)      Origin: Roman
Hong Shao Rou (Red-braised pork belly)      Origin: Britain	In Piscibum Elixis (Of Poached Fish)      Origin: Roman

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