Here is my late extract addition recipe. I have only made it once, but it came out perfectly.
Half-Hour Hefeweizen (HHH)
Batch Size: 5.0 gallons
Boil Volume: 2.25 gallons
Yeast: Wyeast 3068 (75% AA)
OG: 1.052
FG: 1.013
IBU: 15
ABV: 5.0%
SRM: 3-5
Ingredients:
5.6 lbs Wheat DME
0.75 oz Hallertau hop pellets (3.2 AA)
Wyeast 3068
5.25 gallons water (plus additional, as needed)
Directions:
1. Boil 2.25 gallons water; turn off flame.
2. Add 1.0 lb wheat DME, stirring until dissolved and 0.75 oz hallertau (3.0 AA) hop pellets.
3. Boil for 30 minutes; turn off flame.
4. Add 4.6 lbs wheat DME in 1 lb increments, stirring each until dissolved.
5. Let sit for 15 minutes.
6. Add 3.0 gallons cold water to fermenter.
7. Add wort to fermenter; top with water, as necessary, up to 5.0 gallons.
8. Cool in ice water bath or with a wort chiller, pitch Wyeast 3068 at 70 degrees.
9. Seal in ale pail primary with a vodka-filled airlock for 2 to 3 weeks.
10. Rack to a keg, chill, and force carbonate or rack to a bottling bucket, add 5 oz. corn sugar, and bottle, allowing at least 1 week at room temperature for carbonation.