Did you know that it’s really really easy to make mayonnaise at home? It’s just three ingredients — egg yolks, a squeeze of lemon juice, and some oil — and with an immersion blender, it’s ready in about five minutes. Three ingredients, five minutes of your time, delicious creamy mayo. Let’s do this. Mayonnaise is made by blending two things that would otherwise prefer to stay separated: egg yolks and oil.