French-style mayonnaise typically uses egg yolks only, resulting in a richer, more intensely flavored and colored product, while American-style mayonnaise uses whole eggs, leading to a lighter flavor and color.
The primary difference between French and American mayonnaise lies in the ingredients and their proportions. French mayonnaise, often considered the classic version, relies solely on egg yolks as the emulsifier. This concentrated source of fat and lecithin (a natural emulsifier found in egg yolks) creates a very rich, creamy, and intensely flavored mayonnaise. The color is typically a deep yellow, almost orange, due to the high concentration of yolk.
American mayonnaise, on the other hand, uses whole eggs. This inclusion of egg whites dilutes the fat content and lecithin, resulting in a lighter flavor and a paler, almost white, color. The texture is also generally less dense and more commercially palatable to a wider audience. While both styles use oil, acid (vinegar or lemon juice), and seasonings (salt, mustard), the fundamental difference in the egg component dictates the final product's characteristics. The type of oil used can also influence the flavor; neutral oils like canola or grapeseed are common in American mayonnaise, while olive oil is sometimes used in French mayonnaise for a more pronounced flavor.
When making homemade mayonnaise, ensure all ingredients are at room temperature. This helps the emulsion form properly and prevents the mayonnaise from separating.