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Spanish Onion

Last Updated on June 27, 2022 by Simply Healthy Family - Team

Spanish Onion

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A Spanish onion is a type of Mediterranean onion. With its mild, sweet flavor, the Spanish onion is often eaten raw in salads and is also a popular ingredient in many recipes for cooked dishes.

What is a Spanish Onion?

chopping Spanish Onion

A Spanish onion is an onion about the same size as an orange, with white or yellow skin and a fine, grainy texture. This variety of onions has a less pungent aroma than other onions, due to its low sulfur content.

These onions are easy to grow, making them popular with home gardeners. Because the onions originated in the Mediterranean, they grow well in hot, humid areas. Spanish onions are cultivated in many areas in Spain, where they are popular in local produce markets.

What Do Spanish Onions Taste Like?

Spanish Onions Taste

Spanish onions have a mild flavor and are often eaten raw, either sliced in salads or used as a garnish. The onion’s skin is thin and delicate, while the flesh is tender and softer than that of other onions.

Because of their high natural sugar content, Spanish onions are sweet and juicy. This sweetness makes Spanish onions ideal for making caramelized onions.

Are Spanish Onions Healthy?

Spanish onions are healthy because they contain high levels of antioxidants, which help to lower cholesterol in the blood, reduce triglyceride levels, and protect against heart disease.

Because the variety contains anti-inflammatory properties, it helps to lower blood pressure and prevent blood clots.

However, eating excessive amounts of any onions, including Spanish onions, is unhealthy because eating onions in excess can cause digestive problems like acid reflux.

Spanish Onion Substitutes

Spanish onions can be used as substitutes for any onion to make a recipe sweeter. If a recipe calls for Spanish onions, other onions can also work as substitutes. Here are some ways that Spanish onions compare to other varieties.

Spanish Onions vs. Yellow Onions

yellow onion
Yellow onions have a higher acid content and a tarter flavor than Spanish onions.

These onions are also smaller and have a thicker, tougher skin than Spanish onions. Spanish onions have more tender flesh.

For a tarter flavor with more of a tang, use yellow onions as a substitute for Spanish onions in salads and cooked foods.

Spanish Onions vs. Sweet Onion

sweet onion

Although the Spanish onion is rated as a sweet onion variety, sweet onions have less sulfur and more natural sugar. These qualities make sweet onions even sweeter than Spanish onions.

Sweet onions can be a substitute for Spanish onions when eaten raw in salads, and in cooked foods. Use sweet onions for more intense sweetness in salads, salsas, sauces, and casseroles.

Spanish Onion vs. White Onion

white onion
White onions are tarter and less sweet than Spanish onions. Use white onions in salads and cooked foods for a more pungent, tangy flavor.

However, the strong, pungent flavor of white onions can be reduced during cooking, which can make the white onion a more suitable substitute for Spanish onions.

Spanish Onion vs. Vidalia Onion

Vidalia Onion

The Vidalia onion is an extra-sweet onion that is popularly eaten raw in salads and added to cooked sauces and salsas. Because both varieties are sweet, so Vidalia onions can substitute for Spanish in most recipes.

Where to Buy Spanish Onions

Most supermarkets and fruit and vegetable stores sell Spanish onions. These onions are usually planted towards the end of winter and ripen in mid-summer, so the variety is available from mid-July to mid-September.

Some large supermarket chains use cold-storage facilities to prolong the availability period of these onions, often selling Spanish onions that have not been freshly harvested. While these onions are still good to eat, they are better when fresh. Smaller specialty fruit and veg stores are more likely to sell freshly harvested Spanish onions.

How to Plant and Harvest Spanish Onions

planting Spanish onion

If finding Spanish onions is difficult, you can grow Spanish onions yourself. These onions are easy to grow, and ensure that you have genuine Spanish onions and not any other type of onion.

Choose a spot in full sun for growing Spanish onions and plant seeds from March–April. Planting a few seeds every two weeks throughout March and April will ensure you have a constant supply of Spanish onions throughout the summer.

Sow seeds in rich soil, 3–4 inches apart. Fertilizing with sulfate-rich fertilizer encourages more tart, stronger onions, while using a nitrate-based fertilizer results in a milder, sweeter flavor.

Keep the soil moist by watering lightly every three days. Avoid over-watering, which could cause rotting. About four months after planting, when the tops of the onions start to bend over and the color changes from greenish-white to brown, the onions are ready for harvesting.

How to Store Spanish Onions

Leave Spanish onions out in the open to dry for one week after harvesting, then remove the tops so that only 1 inch of stem remains.

Spanish onions will last for up to two weeks when stored correctly. Store Spanish onions in a basket in a cool, dry place, out of direct sunlight. Avoid placing the onions in a plastic bag because onions sweat, causing moisture to build up in the bag, which makes the onions go moldy and rot.

Don’t store whole Spanish onions in the fridge. The onions will become soft and lose their flavor. Once an onion has been cut, store the remainder of the onion in a sealed glass container in the fridge, where it will last for a week to 10 days.

Storing cut or sliced onions in a plastic container transfers the onion’s pungent smell to the container, and it’s difficult to get rid of the smell afterward.

Using Spanish Onions in Recipes

Raw slices of Spanish onion are great in salads and as toppings on burgers or hot dogs. Grill a thick piece of Spanish onion for two minutes before putting it on your burger as a sweet topping.

For a sweet flavor with an onion tang, add sliced or chopped Spanish onions when cooking sauces, salsas, stews, and soups.

Like other onions, Spanish onions will make you cry when chopping or slicing because the natural chemicals in the onions release sharp fumes. Here are some tips to avoid these fumes:

  • Wear safety or swimming goggles to protect your eyes from the onion’s fumes
  • Work in front of a fan that blows the fumes away from you
  • Use a sharp knife to limit the damage to the cells containing the chemicals, creating fewer fumes. A sharp knife also enables you to work as quickly as possible
  • Burn a scented candle next to your workspace
  • Soak the onions in cold water for a few minutes before cutting them

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