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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Patinam ex Lacte (Milk Casserole)      Origin: Roman	Penwaig wedi Stwffio (Stuffed Herring)      Origin: Welsh	Pindasaus (Dutch Peanut Sauce)      Origin: Netherlands
Patka sa kiselim kupusom (Duck with Sauerkraut)      Origin: Croatia	Penzance Cake II      Origin: England	Pineapple and Carnation Fruit Cake      Origin: Britain
Pau-Pau Chatni (Papaya Chutney)      Origin: Seychelles	Pepes Ikan (Fish in Curry Sauce)      Origin: Indonesia	Pineapple Pudding      Origin: India
Pav Bhaji Masala      Origin: India	Pepes Ikan (Fish in Curry Sauce)      Origin: East Timor	Pineapple Pulissery      Origin: India
Payn Ragonn      Origin: England	Pepper Chicken      Origin: Sierra Leone	Pineapple Rasmalai      Origin: India
Pe Htamin (Lentil Rice)      Origin: Myanmar	Pepper Pasta Pie      Origin: South Africa	Pineapple Upside-down Pudding      Origin: Britain
Pe Kyar Zan Thoke (Glass Noodle Salad)      Origin: Myanmar	Pepper Soupe de Poisson (Fish Pepper Soup)      Origin: Cameroon	Pineappleweed and Coconut Ice Lollies      Origin: Britain
Peaches with Creamy Mascarpone Filling      Origin: Britain	Perch Benachin      Origin: Gambia	Pineappleweed Jelly      Origin: Scotland
Peanut and Chicken Kebabs      Origin: Britain	Perkedel Kentang (Potato Patties)      Origin: Indonesia	Pineappleweed Skolebrød      Origin: Scotland
Peanut and Greens Soup      Origin: African Fusion	Persian Jewelled Rice      Origin: Iran	Pintade de Guinée (Guinean Guineafowl)      Origin: Guinea
Peanut Brittle      Origin: Britain	Pesach Chremslach (Fruit and Nut Fritters for Passover)      Origin: Jewish	Pioniono de Arquipe y Coco (Dulce de Leche and Coconut Roll)      Origin: Colombia
Peanut Butter Cheesecake      Origin: Britain	Peshwari Naan      Origin: India	Pipián (Chicken in Peanut Sauce)      Origin: Philippines
Peanut Butter Waffles      Origin: American	Pesmol (Mackerel with Bell Pepper in a Coconut and Chilli Sauce)      Origin: Indonesia	Piragua      Origin: Puerto Rico
Peanut Chicken Curry      Origin: Fusion	Peson of Almayne (German Peas)      Origin: England	Pisam Farsilem (Pressed Peas)      Origin: Roman
Peanut Clusters      Origin: Britain	Pesto alla Genovese (Genoan-style Pesto)      Origin: Italy	Pisces Scorpiones Rapulatos (Scorpion Fish with Turnips in Saffron Sauce)      Origin: Roman
Peanut Cookies      Origin: Britain	Pesto Bara Lawr a Garlleg Gwyllt (Laverbread and Wild Garlic Pesto)      Origin: Welsh	Pista Kulfi (Pistachio Ice Cream)      Origin: India
Peanut Macaroons      Origin: Sudan-a	Pesto Gwymon (Seaweed Pesto)      Origin: Welsh	Pistachio and White Chocolate Burfi      Origin: Anglo-Indian
Peanut Nougat      Origin: Rwanda	Pesto Petiolata      Origin: Italy	Pistachio and Yoghurt Cake      Origin: Britain
Peanut Rougail      Origin: Mauritius	Petits Gâteaux au Sureau (Elderberry Muffins)      Origin: Switzerland	Pistachio Dukkah      Origin: Australia
Peanut Soup      Origin: West Africa	Peynirli Künefe (Turkish Cheesecake)      Origin: Turkey	Pistachio Fudge      Origin: American
Peanut-crusted basa fillets      Origin: Britain	Phali (Young Beet Greens in Walnut Sauce)      Origin: Georgia	Pistachio Nut Pâté      Origin: Spain
Pear and Apple Ginger Galette      Origin: America	Phirni (Sweet Rice Pudding)      Origin: India	Pit Pit in Coconut Cream      Origin: Papua New Guinea
Pear Raspberry Smoothie      Origin: American	Piña Colada Cupcakes      Origin: Britain	Pit Pit in Coconut Cream      Origin: Fiji
Pears with Cinnamon and Wine      Origin: Roman	Pia Sua (Coconut Pudding)      Origin: Tuvalu	Pit Pit in Coconut Cream      Origin: Niue
Pecan Brie Tarts      Origin: Britain	Pia Sua (Coconut Pudding)      Origin: Solomon Islands	Pit Pit in Coconut Cream      Origin: Papua
Pecan Coffee Fudge      Origin: Britain	Pia Sua (Coconut Pudding)      Origin: Kiribati	Pit Pit in Coconut Cream      Origin: Samoa
Peixinhos da Horta (Deep Fried Battered Beans)      Origin: Portugal	Piahia (Coconut Milk Sauce)      Origin: Federated States Micronesia	Pit Pit in Coconut Cream      Origin: Tonga
Peli Rwm Nadolig (Christmas Rum Balls)      Origin: Welsh	Picau ar y Maen II (Welsh Cakes II)      Origin: Welsh	Pit Pit in Coconut Cream      Origin: Vanuatu
Penang Prawn Curry      Origin: Thailand	Pickled Spiced Acorns      Origin: Britain	Pit Pit in Coconut Cream      Origin: Kiribati
Penang-style Nyonya Fish Curry      Origin: Malaysia	Pig Tail Bouillon with Dumplings      Origin: Saint Lucia	Pit Pit in Coconut Cream      Origin: Federated States Micronesia
Penfras Cymraeg Wedi Pobi (Welsh Cod Bake)      Origin: Welsh	Pigeon Breast with Red Wine Gravy, Roast Leeks and Wild Mushrooms      Origin: Britain	Pit Pit in Coconut Cream      Origin: Cook Islands
Penne with Fresh Pumpkin Sauce      Origin: American	Pigeons grillés au makala (Grilled Makala Pigeons)      Origin: DR-Congo	Pit Pit in Coconut Cream      Origin: New Caledonia
Pennywise Fruit Cake      Origin: Britain	Pilaf-Stuffed Onions      Origin: Middle East
Penwaig Wedi Stwffio (Stuffed Herring)      Origin: Welsh	Pinafal wedi Piclo (Pickled Pineapples)      Origin: Welsh

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