here's the 90-Minuet IPA clone for Orrelse from Dogfish Head Brewery, that was in the September 2004 issue of BYO. it was done by Sam Calagione and Andy Tveekrem of Dogfish for BYO.
5 g, all-grain
o.g. 1.088 f.g. 1.021
ibu's 90 srm 13 abv 8.7%
16.5 lbs Pilsner Malt
1.66 lbs. amber malt (35)
16 AAU Amarillo hops (90-0 mins)
(2.0 oz of 8% aa)
8.0 AAU Semicoe hops (90-0 mins)
(0.62 oz of 13% aa)
8.0 AAU Warrior hops (90-0 mins)
(0.53 oz of 15% aa)
1 oz Amarillo hops (dry hops)
0.5 oz Simcoe hops (dry hops)
0.5 oz Warrior hops (dry hops)
1 tsp Irish Moss (15 mins)
Wyeast 1099 (Whitbread Ale Yeast)
0.75 cup corn sugar for priming
Mash in @ 122 F, then raise the temperature to 149 F until conversion is complete. Mash out to 170 F. Boil the wort for 105 minutes. Starting with 90 minutes left in the boil, begin slowly and evenly adding hops to the kettle. (This works out to a little over 0.25 oz of hops every 7.5 minutes.) Start fementation @ 71 F and let raise to 74 F. Dry hop in secondary @ 71 F for 3-5 days, then cool to 32 F.
that's all the info they had. i'm sure a single infusion will work fine.