There was widespread consensus that this was absolutely phenomenal:
Brewer: Brew
"Doing this up tonight after work. I bought a 4lbs pie pumkin yesterday, diced it and roasted in the oven at 350F for 60 minutes. Came out with 1.4 lbs of nicely roasted pumkin to add to the mash. I'll be interested to see if its detectable... My pumkin spice is equal parts Cinnamon and Ginger, 1/4 part nutmeg.
Recipe: Pumkin Spiced Ale
Style: Spice, Herb, or Vegetable Beer
Batch Size (fermenter): 18.93 l
Boil Time: 60 Minutes
OG / FG / ABV / Ratio: 1.047 SG / 1.007 SG / 5.1 % / 0.292
Color / IBU: 14.0 SRM / 13.6 IBUs
Grains: Amt Name Type # %/IBU
1 lbs Rice Hulls (0.0 SRM) Adjunct 1 10.0 %
1.40 lb Pumkin Slices (Mash 60.0 mins) Flavor 2 -
8 lbs Pale Malt (2 Row) US (2.0 SRM) Grain 3 80.0 %
8.0 oz Caraaroma (130.0 SRM) Grain 4 5.0 %
1.5 oz Roasted Barley (300.0 SRM) Grain 6 0.9 %
1.5 oz Chocolate Malt (350.0 SRM) Grain 5 0.9 %
Boil: Amt Name Type # %/IBU
5.0 oz Brown Sugar, Light (8.0 SRM) Sugar 7 3.1 %
1.00 oz Crystal [3.50 %] - Boil 60.0 min Hop 8 13.6 IBUs
1.00 Items Whirlfloc Tablet (Boil 15.0 mins) Fining 9 -
1.00 tsp Pumkin Pie Spice (Boil 15.0 mins) Spice 10 -
Ferment: Amt Name Type # %/IBU
1.0 pkg Safale American (DCL/Fermentis #US-05) Yeast 11 -
Mash Schedule: Single Infusion, 150F Two Sparges
Yes the pumkin pie spice was 1/2 tsp Cinnamon, 1/2 tsp Ginger and 1/5 tsp nutmeg. Added to the boil at flameout and steeped for 10 minutes. Then another added to the keg after soaking in 1/3 cup of spiced rum. Actual recipe called for doing this in the secondary - I imagine it wouldn't matter much...
The mashed pumkin does seem to add a flavor, but not very strong. I noticed that before I added the spice / rum to the keg, this was basically a beer with no hop aroma / flavor and was not nice! The spice / rum takes the place of the hops though and really balances it out."