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Lemon

Fresh citrus fruit with high vitamin C content and aromatic acidity.

Wiki about lemon Nutri-Score A Vegan Yes Gluten-free Yes Lactose-free Yes Nut-free Yes
NUTRITION / 100 g
29 kcal 1.1 g Protein 9.3 g Kohlenhydrate 0.3 g Fett

Introduction

Fresh lemon
I have a special relationship with the lemon that goes far beyond taste. From the first cut a bright, almost electric scent escapes, one that can brighten even the gloomiest thought. I still remember a rainy afternoon when a whole basket of lemons turned the kitchen into something like sunshine.

The lemon is botanically a citrus fruit and chemically a small wonder: citric acid and ascorbic acid (vitamin C) provide freshness, shelf life and a tart counterpoint that balances fat and sweetness. In cooking the secret is often the balance between juice and zest, because the essential oil in the peel contains the most intense aromas.

I use lemons in so many situations that sometimes I wonder how I ever managed without them. A colleague of mine once swore that lemon in his tea was the best remedy for Monday morning, and I tried it — a small squeeze really makes a difference.

Practical uses of the lemon:

  • In the kitchen: for seasoning salads, fish, marinades and dressings.
  • In baking: for lemon cake, glazes and to activate baking powder.
  • Preserving: preserved lemons in the Moroccan style add depth to dishes.
  • In the home: as a natural cleaner and odor remover.
A tip I like to pass on: grate the peel before juicing, then add it to the bowl. This preserves the essential intensity and the juice keeps a pure freshness. I prefer to store lemons loosely in the vegetable drawer, sometimes in a bowl at room temperature if they will be used quickly.

For me the lemon is more than an ingredient; it is a small hero in the kitchen and everyday life that achieves great effect with a few drops. It brings brightness to the plate and a small, reliable cheer on a grey day.

Availability & types


Availability and types of lemon can vary widely. A lemon is a round, yellow fruit with a sour taste, used in many kitchens around the world. Here I explain where lemons come from, where they grow, which varieties exist and how you can buy them — all explained simply so a 12‑year‑old can understand easily.

Origin
Lemons originally come from Asia, probably from the area between India and China. Over many years people carried the plant to other countries. Thus lemons became a familiar fruit in Europe, Africa and America. You can imagine it like a favorite toy that gets passed around and becomes known in many places.

Growing regions
Lemons grow best where it is warm and winters are not too cold. Important growing regions include:
  • Mediterranean (Spain, Italy, Greece) — supplying many lemons for Europe.
  • USA (especially California, Florida) — where many lemons are also grown.
  • South America (e.g. Argentina) — exports lemons to other parts of the world.
  • Asia (India, Turkey) — countries with a long lemon tradition.
You can find lemons year‑round because different regions harvest at different times. It’s like people in different time zones: somewhere it’s always daytime.
Varieties and types
There are many lemon varieties. Each variety has its own taste, shape and peel. Here are some well‑known examples, explained simply:

  • Eureka — the classic supermarket lemon: juicy, with pronounced acidity.
  • Lisbon — similar to Eureka, often with a slightly thinner peel and possibly many seeds.
  • Meyer — a bit sweeter and milder than other lemons; it almost feels like a mix between lemon and orange.
  • Verna — a Spanish variety that is large and juicy.
  • Sorrento / Femminello — known for fragrant peel, often used for limoncello and baking.
In addition to varieties there are variants and related fruits:
  • Organic lemons — grown without synthetic pesticides.
  • Unwaxed — the peel is not coated with wax; good if you want to grate the peel.
  • Concentrate, juice, peels — bottled lemon juice, frozen juice or dried peels are practical when fresh fruit is not available.
Availability in stores
Lemons are usually available year‑round in supermarkets. In spring and summer more fresh varieties are often available; in autumn and winter lemons come from warmer countries. When buying, look for firm skin and weight: a juicy lemon feels heavy for its size. Organic lemons sometimes cost more because they are grown more sustainably.

In summary: lemons originally come from Asia, are now grown in many warm regions and are almost always available. There are different varieties such as Eureka, Lisbon and Meyer, which differ in taste and peel. You can buy fresh lemons, juice or peels — depending on whether you want to cook, bake or flavor a drink. Each variety has its own little character, similar to different apple varieties, so you can easily find the lemon you like best.

Details & nutrition

Property Value
Unit g
Average weight per piece 120
Calories per 100 29
Protein per 100 1.1
Carbohydrates per 100 9.3
Sugar per 100 2.5
Fat per 100 0.3
Saturated fat per 100 0.0
Monounsaturated fat 0.0
Polyunsaturated fat 0.1
Fiber per 100 2.8
Vitamin C (mg) per 100 53
Vitamin D (IU) per 100 0
Calcium (mg) per 100 26
Iron (mg) per 100 0.6
Nutri-Score A
CO₂ footprint 0.4 kg CO2e/kg
Origin Spain, Italy (depending on season)
Gluten-free Yes
Lactose-free Yes
Nut-free Yes
Vegan Yes
Note For zesting, preferably use untreated (organic) lemons; juice and peel can be used separately.

Technical & scientific information


Lemon (Citrus limon) is a cultivated citrus fruit of the Rutaceae family, used worldwide for its acidic juice and aromatic scent. Botanically it is a berry (hesperidium) with a thick, oil‑rich peel (flavedo), a white albedo (mesocarp) and juicy pulp divided into segments. The fruit varies in size, shape and peel color depending on variety and ripeness.

Physical and chemical properties: Fresh lemon juice has a low pH, typically between 2.0 and 2.6, due to a high content of organic acids. The dominant acid is citric acid, often present at 5–8 g per 100 g in the juice. Other organic acids such as malic and D‑citric acid occur in smaller amounts. The water content of the fruit is about 85–90% of the fresh mass.

Main constituents and nutritional values: Per 100 g of edible fresh mass, lemon roughly contains:

  • Calories: about 20–30 kcal
  • Water: 85–90 g
  • Carbohydrates: 6–10 g (including sugars and soluble fibers like pectin)
  • Fiber: ~2–3 g (mostly pectin)
  • Vitamin C (ascorbic acid): typically 30–60 mg; content influenced by varietal differences and storage
  • Minerals: mainly potassium, with small amounts of calcium, magnesium and phosphorus
Secondary plant compounds: Peel and pulp contain aromatic essential oils, flavonoids and polyphenols. The dominant terpene in peel oil is limonene, which often makes up 60–90% of the oil fraction and is largely responsible for the citrus aroma. Other components include myrcene, β‑pinene and citral. Flavonoids such as hesperidin and eriocitrin contribute to antioxidant properties.

Processing techniques: Lemons are eaten raw, pressed, dried or processed further. Common methods include:

  • Cold pressing to obtain juice or peel oil, preserving volatile aromas and nutrients at low temperatures.
  • Steam or cold‑press distillation to isolate essential oils from the peel.
  • Pasteurization of juice for microbial stabilization, which can lead to losses of heat‑sensitive vitamins like vitamin C.
  • Concentration by vacuum evaporation and freeze‑drying to produce juice concentrates or powders.
Functional properties in foods: Citric acid functions as an acidulant, flavor carrier and chelating agent that binds metal ions, thereby inhibiting enzymatic browning reactions. Pectin from the albedo is suitable as a gelling agent in jams and jellies. Peel oils are used as natural flavorings.

Health aspects: Vitamin C is essential for collagen synthesis, antioxidant defense and iron absorption from plant foods. Flavonoids and terpenes show antioxidant, inflammation‑modulating and antimicrobial effects in vitro and in animal studies, although their clinical relevance in humans requires further clarification. Due to its low pH, frequent direct contact with concentrated lemon juice can lead to dental enamel erosion. In addition, phototoxic psoralens (e.g. bergapten) are known in some citrus species and can cause phytophotodermatitis on skin exposed to sunlight; in lemons these compounds are generally present only in small amounts, yet caution is advised when skin contacts fresh juice followed by sun exposure.

Overall, the lemon is well characterized botanically and chemically: it provides low calories, a notable amount of vitamin C, functional compounds such as pectin and essential oils, and citric acid with diverse technical and nutritional roles. Processing and storage significantly influence the composition and effectiveness of heat‑ or light‑sensitive components.

Wiki entry for: lemon
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