Tomato soup

**Tomato soup** is a soup with tomatoes as the primary ingredient. It may be served hot or cold in a bowl, and may be made in a variety of ways. It may be smooth in texture, and there are also recipes that include chunks of tomato, cream, chicken or vegetable stock, vermicelli, chunks of other vegetables and meatballs. Popular toppings for tomato soup include sour cream or croutons. In the United States, the soup is frequently served with crackers, which may be crumbled onto the soup by the diner, and a grilled cheese sandwich. Tomato soup is one of the top comfort foods in Poland and the United States. It can be made fresh by blanching tomatoes, removing the skins, then blending them into a puree.

The first published tomato soup is mentioned by Eliza Leslie in 1857 in her final publication *New Cookery Book*. Joseph A. Campbell's recipe for condensed tomato soup in 1897 further increased its popularity.

# Prepared varieties

Commercially prepared tomato soup is available in a variety of forms, including canned, condensed and in dehydrated powder form. "Tomato" ranks among the top three flavors of soup produced by the Campbell Soup Company.

# Canned tomato soup

Canned tomato soup is primarily tomato puree: that is, tomato paste and water with a few other ingredients added to enhance flavor and physical properties of the food. The tomato is a high acid food therefore, "the tomato is not considered a high-risk food, as the pH of the fruit generally ranges from pH 4.2–4.9 with an average of about 4.5. At this point pathogens are unlikely to grow". However, there are still some foodborne pathogens that can pose as a major problem when it comes to the safety of the food and its shelf life stability. The main concern when canning is anaerobic microorganisms that produce toxins like *Clostridium botulinum*. Even though the tomato is a high acid food it still falls in the range where this organism can grow and produce toxin pH 4.6–8.5 with an optimum growing temperature between 30–40 °C and a maximum temperature of 50 °C. Even if the bacteria are killed they release heat resistant spores that if they start to multiply become a threat.

### **Main ingredients and their functionality**

The main ingredient for tomato soup is tomato puree.

The cell wall structural importance for the plant's growth and stability in the ripening process is equally important to the quality of the tomato products it can produce. The pectin and cellulose are what determine the apparent viscosity of the tomato product. If they are broken at higher temperatures more enzymes are deactivated than if they are broken at lower temperatures.

High-fructose corn syrup is sometimes added to tomato soup to make it sweeter. HFCS is composed of both glucose and fructose in their free monosaccharide form that doesn't crystallize readily. HFCS is also important in binding water, the monosaccharaides of fructose and glucose have the ability to bind to water in the product. The binding of water helps to reduce microbial growth by removing available water from the product it can also prevent the separation of water in products like sauces and soups.

Wheat flour is composed of six main groups, carbohydrates, proteins, enzymes, lipids, minerals and vitamins. Flour is added to tomato soup to increase its viscosity. The starch in the flour acts as a gelling agent and increases the viscosity of the product. When starch granules found in the flour are heated in solution they become less ordered and begin to gel. During this process of gelatinization the crystal like structures of the starch granules disappear and the swelling starts creating a viscoelastic product.

# Gazpacho

Gazpacho is a tomato soup of Spanish origin, served cold. It originates in the region of Andalucía in southern Spain. Gazpacho is widely consumed in Spanish cuisine, as well as in neighboring Portugal, where it is known as *gaspacho*. Gazpacho is mostly consumed during the summer months, due to its refreshing qualities and cold serving temperature. Many variations of gazpacho exist.

# Accompaniments

Tomato soup is often paired with a grilled cheese sandwich, toast, crumpet or English muffin.

# See also

* List of cream soups
* List of soups
* List of tomato dishes