Total time 10 min
To prepare the mayonnaise: - Break an egg into a blender, add a splash of vinegar, salt and plenty of olive oil. - Put the blender arm at the bottom of the mixture and blend without lifting it until the mixture emulsifies. - When it starts to emulsify, move the blender gently up and down.
Set aside the mayonnaise in the fridge while you prepare the avocados.
Cook shrimp for 2-4 minutes and allow to cool (if using frozen precooked shrimp, thaw first)
Cut the avocados in half, keeping the skins.
Mix the flesh from the avocados with the tuna in a bowl
Fill the avocado skins with the mixture.
Cover with a layer of avocado and top with shrimp.