Whisk the eggs and condensed milk together… and cook over a double boiler until very hot and thickened. This will take several minutes (about 15-20 for me).
Melt in the ghee and continue whisking until thick and pulling away from the sides of the pan and resembles mashed potatoes or thick polenta. About 45 minutes.
Press into a buttered baking pan or mold, about 8×8.
Refrigerate until set and chilled – at least four hours – no baking needed.