I will try your method tonight. The idea with egg yolk is indeed interesting. Egg yolk is one of the richest sources of lecithin, and it's best absorbed if the yolk is raw.
I used to buy egg yolk lecithin in capsule form until I discovered that one egg yolk contains the same amount of Phospatidylcholine as 30 capsules of egg yolk concentrate. Phospatidylcholine is one of the substances in lecithin that is claimed to lower the biles viscosity, and thereby dissolve gallstones.
Of course soy lecithin is a better alternative for vegans.