Position rack in top third of oven; preheat to450°F. Arrange hens, skin side up, on largerimmed baking sheet. Finely grind cuminand next 3 ingredients in spice mill.
Brush hens with oil.
Sprinkle on bothsides with spice mixture. Roast hens untilcooked through, about 35 minutes.
Meanwhile, combine all remainingingredients in processor. Blend until almostsmooth. Season sauce with salt and pepper.