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 4134 recipes in total:

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Pani Popo (Bread Rolls Cooked in Coconut Milk)      Origin: Samoa	Passion Cake      Origin: Britain	Peanut Chicken Curry      Origin: Fusion
Pani Popo (Bread Rolls Cooked in Coconut Milk)      Origin: American Samoa	Passover Banana Sponge Cake      Origin: Jewish	Peanut Clusters      Origin: Britain
Panjeeri (Nuts, Seeds and Tree Sap Snack)      Origin: Pakistan	Passover Matzoh Pudding      Origin: Jewish	Peanut Cookies      Origin: Britain
Panjiri      Origin: India	Pastai Briwgig a Llugaeorn (Pork Mince and Cranberry Mini Pies)      Origin: Welsh	Peanut Macaroons      Origin: Sudan-a
Pansotti di Rapallo (Pansotti with Walnut Sauce)      Origin: Italy	Pastai Briwgig Eidion a Nionod (Leek and Caerphilly Cheese Crumble Tart)      Origin: Welsh	Peanut Nougat      Origin: Rwanda
Pão de Cacau (Chocolate Loaf)      Origin: Sao Tome	Pastai Cig Llo (Veal Pie)      Origin: Welsh	Peanut Rougail      Origin: Mauritius
Pão Doce      Origin: Sao Tome	Pastai Cig oen Cymraeg a Phwmpen (Welsh Lamb and Marrow Pie)      Origin: Welsh	Peanut Soup      Origin: West Africa
Papas de Mandioca (Cassava Porridge)      Origin: Mozambique	Pastai Cwnhingen (Rabbit Pie)      Origin: Welsh	Peanut-crusted basa fillets      Origin: Britain
Papaya and Orange Soup      Origin: Anguilla	Pastai Ystumllwynarth (Oystermouth Pie)      Origin: Welsh	Pear and Apple Ginger Galette      Origin: America
Papaya Chicken and Coconut Milk      Origin: Solomon Islands	Pastel De Choclo (Corn Pudding)      Origin: Argentina	Pear Raspberry Smoothie      Origin: American
Papaya Pudding      Origin: Aruba	Pašticada (Croatian Beef Stew)      Origin: Croatia	Pears with Cinnamon and Wine      Origin: Roman
Papeeta Kari (Green Papaya Curry)      Origin: India	Pastiera Napoletana (Naples Easter Cakes)      Origin: Italy	Pecan Brie Tarts      Origin: Britain
Papuan Banana Cake      Origin: Papua New Guinea	Pastilla (Moroccan Meat Pie)      Origin: Morocco	Pecan Coffee Fudge      Origin: Britain
Papuan Banana Cake      Origin: Papua	Pastilla au Poulet (Chicklen Pastilla)      Origin: Morocco	Peixe Seco Com Óleo de Amendoim (Dried Fish with Groundnut Oil)      Origin: Mozambique
Paradise Cake      Origin: Scotland	Patiala Chicken Curry      Origin: India	Peixinhos da Horta (Deep Fried Battered Beans)      Origin: Portugal
Paradise Slice      Origin: Scotland	Patina Cotidiana II (Everyday Casserole II)      Origin: Roman	Peli Rwm Nadolig (Christmas Rum Balls)      Origin: Welsh
Parcha Bozbash (Lamb Soup with Chestnuts and Quince)      Origin: Armenia	Patina Versatilis (Upside-down Dish)      Origin: Roman	Penang Prawn Curry      Origin: Thailand
Parcha Bozbash II (Lamb Soup with Chestnuts, Quince, and Prunes)      Origin: Georgia	Patina Versatilis Vice Dulci (Nut Custard Turnover)      Origin: Roman	Penang-style Nyonya Fish Curry      Origin: Malaysia
Parmentier de Canard (Duck Parmentier)      Origin: France	Patinam Apicianam (Apician Casserole)      Origin: Roman	Penfras Cymraeg Wedi Pobi (Welsh Cod Bake)      Origin: Welsh
Parsley Pesto      Origin: Saint Pierre	Patinam ex Lacte (Milk Casserole)      Origin: Roman	Penne with Fresh Pumpkin Sauce      Origin: American
Parsnip and Apples      Origin: Ireland	Patka sa kiselim kupusom (Duck with Sauerkraut)      Origin: Croatia	Pennywise Fruit Cake      Origin: Britain
Parthade Curry      Origin: India	Pau-Pau Chatni (Papaya Chutney)      Origin: Seychelles	Penwaig Wedi Stwffio (Stuffed Herring)      Origin: Welsh
Party Cupcakes      Origin: Britain	Pav Bhaji Masala      Origin: India	Penwaig wedi Stwffio (Stuffed Herring)      Origin: Welsh
Pasanda Sauce      Origin: Britain	Payn Ragonn      Origin: England	Penzance Cake II      Origin: England
Pashka      Origin: Russia	Pe Htamin (Lentil Rice)      Origin: Myanmar	Pepes Ikan (Fish in Curry Sauce)      Origin: Indonesia
Pasilla Mole      Origin: Britain	Pe Kyar Zan Thoke (Glass Noodle Salad)      Origin: Myanmar	Pepes Ikan (Fish in Curry Sauce)      Origin: East Timor
Paska Babka (Easter Babka)      Origin: Belarus	Peaches with Creamy Mascarpone Filling      Origin: Britain	Pepper Chicken      Origin: Sierra Leone
Paska Babka (Easter Babka)      Origin: Russia	Peanut and Chicken Kebabs      Origin: Britain	Pepper Pasta Pie      Origin: South Africa
Paska Babka (Easter Babka)      Origin: Ukraine	Peanut and Greens Soup      Origin: African Fusion	Pepper Soupe de Poisson (Fish Pepper Soup)      Origin: Cameroon
Paska Bobka (Polish Easter Bread)      Origin: Poland	Peanut Brittle      Origin: Britain	Perch Benachin      Origin: Gambia
Paskalya Çöreği (Turkish Easter Bread)      Origin: Turkey	Peanut Butter Cheesecake      Origin: Britain	Perkedel Kentang (Potato Patties)      Origin: Indonesia
Paskha (Russian Easter Cheesecake)      Origin: Russia	Peanut Butter Smoothie      Origin: American	Persian Jewelled Rice      Origin: Iran
Passatelli in Brodo (Passatelli in Broth)      Origin: Italy	Peanut Butter Toffee      Origin: American
Passatelli in Brodo (Passatelli in Broth)      Origin: San Marino	Peanut Butter Waffles      Origin: American

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