I've made our mayonnaise for a long time but recently got to thinking... BACON! Now I almost always make Baconnaise instead!
Crack the egg into a wide-mouth canning jar and add the lemon juice. Blend together and let the mixture sit until it gets close to room temperature – about 5-10 minutes.
Add the salt, mustard powder & softened bacon grease to the jar. With an immersion blender at the bottom of the jar start blending, until ingredients are fully blended.
We go through our mayo pretty quickly so I don’t really know how long it will keep, I’ve read that it will keep several weeks but I’ve never had it long enough to test that. Let me know how long your Baconnaise lasts!