Find your immersion blender and a tall glass that fits the immersion blender.
Crack the egg into the tall glass.
Add 1 tsp. salt on top of the egg.
Add white wine vinegar and Dijon mustard.
Slowly pour the canola oil into the glass.
Place the immersion blender all the way at the bottom of the glass.
Turn on the immersion blender and keep it at the bottom of the glass while blending around.
After a few seconds, begin to slowly lift the immersion blender while still blending in a circular motion. Continue upwards as the mayo thickens.
Mix in tarragon, lemon juice, and bearnaise essence well into the mayo.
Serve!
Keep the display on
Notes
You can also choose to use homemade bearnaise essence. See recipe here.
If you want to use fresh tarragon, use 3 sprigs (without the stems, of course). When my own tarragon reaches a certain size, I pick the sprigs and put them in freezer bags and then in the freezer - that way I have fresh tarragon all year round!