Many older cookbooks will often have recipes calling for a "yeast cake". This is a small cake of active yeast, often 0.6 ounces (17 grams) in weight. They are not normally used today since they are highly perishable and have a short shelf life, even when refrigerated (about 10 days). 1 Yeast Cake can be substituted with 1 packet or 2 1/4 teaspoons of Active Dry Yeast. To substitute a 2 ounce yeast cake, use 3 packets or 6 3/4 teaspoons of Active Dry Yeast
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