To a large bowl, add the melted butter, pumpkin puree, vanilla, cinnamon, nutmeg, ginger and cloves whisking to combine. Whisk in the cold eggs until the batter is smooth and thick. Add in the sugar*, whisking for about 2 minutes. The mixture may appear a bit grainy, that's fine. (*If the batter is still warm at this point, set it aside for 5 minutes to cool a wee more before adding the sugar. You want it to feel close to room temperature at this point.)