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 3570 recipes in total:

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Watercress and Cobnut Soup      Origin: Britain	Wild Garlic and Walnut Mayonnaise      Origin: Britain	Yam with Greens, Onion, and Okra      Origin: Nigeria
Watermelon Otai      Origin: Fiji	Wild Greens Fritters      Origin: Britain	Yapese Taro Fritters      Origin: Federated States Micronesia
Watermelon Otai      Origin: Samoa	Wild Greens Soup      Origin: Britain	Yeasted Barm Brack      Origin: Ireland
Watermelon Otai      Origin: Tonga	Wild Plum Ketchup      Origin: Fusion	Yeasted Currant Loaf      Origin: Britain
Watermelon Otai      Origin: Hawaii	Wildberry Crisp      Origin: British	Yellow Coconut Rice      Origin: Tanzania
Watermelon Otai      Origin: New Zealand	Winter Parsnip Stew      Origin: Czech	Yellow Curry with Swiss Chard and Tofu      Origin: Fusion
Wattakka Soup (Pumpkin Soup)      Origin: Sri Lanka	Winter Rice Pudding with Dried Fruit      Origin: China	Yoghurt and Honey Pancakes with Citrus Fruit      Origin: Britain
West African Couscous      Origin: West Africa	Wontons      Origin: China	Yoghurt Lamb Steaks with Minted Yoghurt      Origin: Britain
West African Curry Powder      Origin: West Africa	Wyau Hwyaden, Dull Ynys Môn (Anglesey-style Duck Eggs)      Origin: Welsh	Yorkshire Curd Tart      Origin: England
West African Fish Rub      Origin: West Africa	Wyau Ynys Môn (Anglesey Eggs)      Origin: Welsh	Yuletide Fruit Bread      Origin: England
West African Meat Kebabs      Origin: West Africa	Xalwad (Peanut Halwa)      Origin: Somalia	Zafrani Murgh      Origin: India
West Indian Cake      Origin: British	Xalwo (Peanut Halwa)      Origin: Djibouti	Zafrani Mutton Korma      Origin: Pakistan
West Sumatran Fish Curry      Origin: Sumatra	Xató (Salt Cod and Tuna Salad)      Origin: Spain	Zamé      Origin: Mali
Wethani Kyet (Dry Burmese Pork Curry)      Origin: Myanmar	Xavier Dumplings      Origin: Italy	Zanzibar Fish Curry      Origin: Tanzania
Wethani Kyet II (Dry Burmese Pork Curry II)      Origin: Myanmar	Xavier Suppe (Xavier Soup)      Origin: Italy	Zanzibar Kashata      Origin: Tanzania
Whim-Wham      Origin: Scotland	Xawaash      Origin: Djibouti	Zarzuela de Mariscos (Seafood Zarzuela)      Origin: Spain
Whipod Cwrens (Currant White Pot)      Origin: Welsh	Xerém Tradicional (Traditional Xerem)      Origin: Cape Verde	Zereshk Polo      Origin: Iran
White Béchamel Sauce      Origin: Britain	Xinxim (Brazilian Chicken and Crayfish in Peanut Sauce)      Origin: Brazil	Zereshk Polo ba Morgh (Saffron Chicken with Barberry Rice)      Origin: Iran
White Bakewell Fudge      Origin: British	Y Gacen Amhosibl (The Impossible Cake)      Origin: Welsh	Zimbabwean Sweet Potato Biscuits      Origin: Zimbabwe
White Caper Sauce      Origin: British	Yaji (Nigerian Meat Seasoning)      Origin: Nigeria	Zom (Bitter Greens with Meat)      Origin: Cameroon
White Curry      Origin: Fusion	Yaji Spice (Suya Spice Blend)      Origin: Nigeria	Zuppa di Ciliege (Stewed Cherries)      Origin: San Marino
White Oyster Sauce      Origin: British	Yalanchy Sarma (Armenian Stuffed Vine Leaves)      Origin: Armenia	Πλατσέντα Λέσβου (Lesbos Placenta)      Origin: Greece
Wild Dewberry Cobbler      Origin: Britain	Yam Balls      Origin: West Africa
Wild Garlic and Mushroom Lasagne      Origin: Britain	Yam Curry      Origin: Vanuatu

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