Combine all ingredients in a wide mouth jar or bowl (big enough for immersion blender to fit).
Blend for approximately 30 seconds until ingredients are combined and the mayonnaise thickens. (Add more salt to taste. Add more apple cider vinegar 1/2 tsp at a time if not thick enough.)
Video
Notes
Pairs perfectly on a sandwich, wrap, tuna salad, or chicken salad!Store in an airtight container in fridge for up to a week.