[header] How to prepare homemade mayonnaise [title] Prepare the ingredients. [step] Gather 1 large egg or 2 small eggs , 8 oz. ( 2.5 dl) of cooking oil, and 1 tbsp. 
( 15 g) lemon juice or vinegar. Leave all of the ingredients out at room temperature for approximately 30 minutes prior to preparing the mayonnaise.