In a large bowl, whisk together the cream, vanilla, yolks, sugar, pumpkin, cinnamon, nutmeg, and ginger. Blend well. Strain into a large bowl, skimming off any foam or bubbles. Divide mixture among 6 - 8 ramekins or custard cups. Place in a water bath and bake until set around the edges, but still loose in the center, about 30 or 40 minutes. Remove from oven and leave in the water bath until cooled. Remove cups from water bath and chill for at least 2 hours, or up to 2 days.