Active Dry Yeast

Until recently, active dry yeast was practically the only yeast one could buy in a supermarket. Usually sold in packaged perforated envelopes, active dry yeast needs to be rehydrated properly before use. The yeast is allowed to dissolve for about 5 minutes in 100°F (38°C) liquid (water in most cases) before being added to the final dough. If the formula calls for water to be at a cooler temperature when it is added to the final dough, the liquid yeast solution should be cooled before the mixing can commence.