You make mayonnaise.
Explanation:
Mayonnaise is an emulsion; a mixture of 2 or more liquids that are normally immiscible. Here, we take egg-yolks, an aqueous solution, and emulsify it with oil. Home-made mayonnaise made with real eggs, and vinegar, and nice oil, and loads of pepper and salt and mustard is rather nice, and is a good and tasty chemistry experiment you can do in your kitchen.