Because it matters...

I love this homemade recipe.
 

Ingredients
1 egg (at room temp)
1 tsp dry mustard
1 tsp salt
1 1/4 cup oil (corn, vegetable, or canola)
1 dash cayenne pepper
3 tbls vinegar
 
Directions

1. Place egg, mustard, salt, cayenne pepper and 1/4 c. oil in blender or food processor and blend on low.
2. While the machine is blending, SLOWLY pour in another 1/2 c. oil. You may have to stop and scrape down the mayo.
3. Add the lemon juice/vinegar and the remaining 1/2 c. oil. Blend until well combined.
4. Store in refrigerator, tightly covered.