It's not unusual for pumpkin pasta sauce to only have a subtle pumpkin taste. That's partly due to the fact that we associate pumpkin flavor with warming spices, which is why you shouldn't skip the nutmeg in this recipe. Try to buy premium pumpkin puree or make your own from scratch. Homemade pumpkin puree made from roasted pumpkin tends to be more flavorful due to the caramelization process.