Because tapioca is one of the few thickeners that does not break down during long, slow cooking, it can be added at the beginning of the cooking time. Thickeners such as flour and cornstarch are best added at the end of the cooking time.
For food safety reasons, recipes made in the slow cooker need to reach a safe cooking temperature (140°F) within 3 hours. That's why it isn't a good idea to assemble the ingredients and refrigerate them or use frozen ingredients.
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