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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Nowmbyls of Muskyls (Mussels in Almond Milk Sauce)      Origin: England	Oil-based Flapjacks      Origin: Britain	Orikhova Masa (Walnut Filling)      Origin: Georgia
Nuernberger Rostbratwuerste (Nuremberg Grilled Sausage)      Origin: Germany	Oka Popo (Samoan Raw Fish)      Origin: Samoa	Orugli Vesak (Lemony Sponge Cake Dessert)      Origin: Croatia
Num Banh Choc (Rice Noodle Fish Soup)      Origin: Cambodia	Oka Popo (Samoan Raw Fish)      Origin: American Samoa	Otak-otak (Spicy Grilled Nyonya Fish Cakes)      Origin: Malaysia
Nước Cốt Dừa (Coconut Milk Sauce)      Origin: Vietnam	Okok (Eru Leaf Stew)      Origin: Cameroon	Ottogi Karē (Ottogi Curry)      Origin: Korea
Nusszopf (German Nut Braid with Marzipan)      Origin: Namibia	Okpa (Bambara Groundnut Breakfast Pudding)      Origin: Nigeria	Oude Sauce      Origin: Britain
Nut Cutlet      Origin: British	Okra Relish      Origin: Tanzania	Overnight Oats      Origin: Britain
Nut-topped Sticky Toffee Pudding      Origin: Britain	Olan      Origin: India	Ox-heart Black Curry      Origin: Sri Lanka
Nutella Swirl Banana Muffins      Origin: Britain	Old Bay Seasoning Mix      Origin: American	Oxeye Daisy Chopsuey      Origin: Fusion
Nutty Fridge Cake      Origin: American	Old Fashioned Carrot Pudding      Origin: Britain	Oxeye Daisy Filo Rolls      Origin: Fusion
Nutty Moroccan Couscous      Origin: Morocco	Olio di Peperoncino (Chilli Oil)      Origin: Italy	Oxeye Daisy Pesto      Origin: Britain
Nutty Rice Burgers      Origin: Britain	Oluwombo      Origin: Uganda	Oxford Sausages      Origin: England
Nyaba      Origin: Sudan	Omajova-Pilz-Ragout mit Hirse (Omajova Mushroom Ragout with Millet)      Origin: Namibia	Pâté Nadolig (Christmas Pâté)      Origin: Welsh
Nyeleng (Beef and Peanut Gumbo)      Origin: Senegal	Oman Baharat      Origin: Oman	Pâte Folle (French Almond Pastry)      Origin: France
Nyembwe Sauce      Origin: Gabon	Ombidi (Namibian Spinach Stew)      Origin: Namibia	Pâtes 'Teuf-Teuf' (Pasta 'Teuf-Teuf')      Origin: Mali
Nyete Greens with Peanut Butter      Origin: South Sudan	Onion Sauce      Origin: Britain	Pão de mel (Honey Loaf)      Origin: Mozambique
Nyona Penang Assam Laska      Origin: Malaysia	Opor Ayam (Java Chicken Curry)      Origin: Indonesia	Pè Thee Thoke (String Bean Salad)      Origin: Myanmar
Nyonya Curry Paste      Origin: Singapore	Opor Ayam Jawa (Javanese Coconut Curry Chicke)      Origin: Indonesia	Pèpè Soup du Cameroun (Cameroonian Pepper Soup)      Origin: Cameroon
Nyonya-style Curry with Eggs      Origin: Malaysia	Orange and Pomegranate Cake      Origin: Britain	Paalag Gosht (Mughlai Lamb with Spinach)      Origin: India
Nyponsoppa (Wild Rosehip Soup)      Origin: Sweden	Orange and Walnut Blintzes      Origin: American	Paasbrod (Dutch Easter Bread)      Origin: Netherlands
Oarweed Chips      Origin: Britain	Orange Bergamot Nuts      Origin: American	Pacific-style Coconut Rice      Origin: Kiribati
Oat Mittai with Fruit and Nuts      Origin: India	Orange Crumble Mince Pies      Origin: Britain	Pacific-style Coconut Rice      Origin: Hawaii
Oatmeal Bilberry Bread      Origin: Northern Ireland	Orange Mincemeat      Origin: Britain	Pad Gra Prow (Holy Basil Beef)      Origin: Thailand
Oatmeal Chocolate Smoothie      Origin: American	Orange Olive Oil Cake      Origin: Fusion	Pad Kee Mao      Origin: Thailand
Oatmeal Posset      Origin: Scotland	Orange Walnut Muffins      Origin: British	Pad Krapow Gai (Spicy Basil Chicken)      Origin: Thailand
Obe Ata (Nigerian Pepper Soup)      Origin: Nigeria	Oranges Douces de Congo (Sweet Congolese Oranges)      Origin: Congo	Pad See Ew (Stir-fried Pork with Noodles and Broccoli)      Origin: Thailand
Obe Eja Dindin (Fried Fish Stew)      Origin: Nigeria	Oranges in Syrup      Origin: Britain	Pad Thai      Origin: Thailand
Obe Eja Tutu (Fresh Fish Stew)      Origin: Nigeria	Orašnice (Walnut Biscuits)      Origin: Bosnia	Padavalanga Parippu Curry (Snake Gourd Curry)      Origin: India
Ocopa de Camarones (Prawn Ocopa)      Origin: Peru	Orašnice (Walnut Biscuits)      Origin: Serbia	Padipe Saasmi (Utupi-style Red Amaranth Leaf Curry)      Origin: India
Ofio Drink (Tiger Nut Drink)      Origin: Nigeria	Orašnice (Walnut Biscuits)      Origin: Croatia	Pado'lalo' (Spicy coconut Aubergine)      Origin: Guam
Ogbono Soup      Origin: Nigeria	Orašnice (Walnut Biscuits)      Origin: Macedonia	Pado'lalo' (Spicy coconut Aubergine)      Origin: Northern Mariana Islands
Ogbono Soup with Ugwu      Origin: Nigeria	Orecchiette with Mushroom Sauce      Origin: Italy	Pahua au curry (Curried Pahua)      Origin: Tahiti
Ogbono Soup with Waterleaf      Origin: Nigeria	Orehnjaca (Walnut Roll)      Origin: Croatia	Pahua Taioro      Origin: Tahiti
Ohn Htamin (Burmese Coconut Rice)      Origin: Myanmar	Orenau wedi Llenwi (Stuffed Oranges)      Origin: Welsh
Ohn-No Khaukswe (Coconut Noodles)      Origin: Myanmar	Oriental Chicken with Broccoli      Origin: Fusion

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