Matzah balls are a traditional Ashkenazi

Ashkenazi Jews

Ashkenazi Jews, also known as Ashkenazic Jews or Ashkenazim , are the Jews descended from the medieval Jewish communities along the Rhine in Germany from Alsace in the south to the Rhineland in the north. Ashkenaz is the medieval Hebrew name for this region and thus for Germany...

 Jewish

Jews

The Jews , also known as the Jewish people, are a nation and ethnoreligious group originating in the Israelites or Hebrews of the Ancient Near East. The Jewish ethnicity, nationality, and religion are strongly interrelated, as Judaism is the traditional faith of the Jewish nation...

 dumpling made from matzah meal.

Some recipes may add a number of ingredients, such as stock

Stock (food)

Stock is a flavoured water preparation. It forms the basis of many dishes, particularly soups and sauces.- Preparation :Stock is made by simmering various ingredients in water, including some or all of the following...

 and seasonings for taste, or seltzer or baking powder for fluffiness. Traditionally, the fat had been schmaltz

Schmaltz

Schmaltz or schmalz is rendered chicken, goose, or pork fat used for frying or as a spread on bread, especially in German and Ashkenazi Jewish cuisine. Also is very common in Ukrainian cuisine Schmaltz or schmalz is rendered chicken, goose, or pork fat used for frying or as a spread on bread,...

(chicken fat), which imparts a distinctive flavor, but vegetable oil

Vegetable fats and oils

Vegetable fats and oils are lipid materials derived from plants. Physically, oils are liquid at room temperature, and fats are solid. Chemically, both fats and oils are composed of triglycerides, as contrasted with waxes which lack glycerin in their structure...

s or margarine

Margarine

Margarine , as a generic term, can indicate any of a wide range of butter substitutes, typically composed of vegetable oils. In many parts of the world, the market share of margarine and spreads has overtaken that of butter...

 may be used. Butter

Butter

Butter is a dairy product made by churning fresh or fermented cream or milk. It is generally used as a spread and a condiment, as well as in cooking applications, such as baking, sauce making, and pan frying...

 is not used, as milk products are not allowed to be used in chicken (meat) soup in accordance with the rules of kashrut

Kashrut

Kashrut is the set of Jewish dietary laws. Food in accord with halakha is termed kosher in English, from the Ashkenazi pronunciation of the Hebrew term kashér , meaning "fit" Kashrut (also kashruth or kashrus) is the set of Jewish dietary laws. Food in accord with halakha (Jewish law) is termed...

.