re: Mayo Recipe Needed

If you are using a blender to emulsify the mayo, then I would avoid olive oil as the speed of the blender blades will break up the oil and leave a bitter taste. Use a neutral oil like peanut and then add a bit of olive oil or tallow at the end for flavor.

1 Egg
240 g Oil
15 g garlic
15 g acid (lemon or vinegar)
15 g dijon
Pinch of salt.
Blend egg, garlic, acid, Dijon and add oil slowly until emulsified.
Add tallow or olive oil for flavor.

To branch out you can add other things like horseradish, soy sauce, etc.

There are some very cool videos for making mayo using an immersion blender and a smallish jar.