Yup. It involves eggs so watch how much you eat.
Is really easy. Whisk a whole egg, no need to separate white and yolk, with the juice of half a lemon. Mix in roughly a table spoon of sun flower oil or olive oil mixed with sunflower. Place in a bowel over a pan of simmering water (in the same way you melt chocolate...or used to melt chocolate!) mixing all the time until you get the thickness you want. chill.