For the best results, ensure your eggs are at room temperature. This helps with emulsification. Drizzle the oil in *very* slowly. Adding it too quickly can cause the mayonnaise to break. If your mayonnaise is too thick, add a teaspoon of water at a time until you reach your desired consistency. Store in an airtight container in the refrigerator for up to 5 days. Experiment with different types of olive oil to find your favorite flavor profile. If you don't have a food processor, you can make this by hand using a whisk, but it will require significantly more elbow grease!