From the town of El Chalten in the Argentinian portion of Patagonia, hike past the Park Headquarters building and up the Mirador des los condores trail. Turn around when you can see the Fitzroy Massif.
After two days of rain, I had heard that the weather was changing. At the first sign of pink in the clouds I ran out of the hostel and power hiked for half an hour to a pre-scouted vantage point. As I arrived and sat down, the sun cleared the horizon and the show started. I took a series of vertical shots hand held, overlapping by about 30%. In 20 minutes the pink color disappeared, and it was time to go back for breakfast.