Mayonnaise (Best Option)
1 tablespoon per 1 tablespoon of butterMayonnaise is an emulsion of oil, egg yolk, and acid, closely mimicking butter's fat content and moisture balance. This helps retain the burger's juiciness and mouthfeel during cooking.
For best results, mix mayonnaise evenly into the ground beef before forming patties to ensure uniform moisture and fat distribution. Avoid adding too much to prevent a greasy texture.
Compared to butter, mayonnaise enhances moisture retention and can slightly improve the tenderness of the burger, while adding a subtle flavor complexity that pairs well with beef.