My kitchen isn't as well stocked as most so :
No mixing bowl - just an empty yogurt pot.
No whisk - just a fork.
No Dijon mustard - Only Colmans English.
No Veg oil - corn oil & olive oil.
Used 1 egg as I didn't want to waste too much if it all went horrible wrong.
It didn't split at all which I was surprised about as I wasn't exactly careful with the oil. Its actually not bad, certainly passes muster. A little looser than shop bought stuff, perhaps I've over worked it or not put enough oil in?
It will certainly do for pouring over the spuds, some green stuff or even a few boiled eggs. Might even stuff some garlic in the next lot