In a tall narrow container (glass jar or stemless wine glass) that an immersion blender will fit into. This is how I find I make aioli that comes out great every time, I have used drink makers, blenders, but they never seem as good as the whipping action of an immersion blender.

Add egg yolk, vinegar, mustard, olive oil, and salt to the glass jar

Place the immersion blender into the jar and begin blending, moving the blender up and down to emulsify

Once it's blended, add in the cranberry sauce and blend until smooth

add additional salt if desired