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Many recipes work well in a slow cooker.
You should generally reduce the amount of liquid called for in a recipe by half. Most recipes need only one-half to one cup of liquid to cook. Vegetables, especially root vegetables like carrots and potatoes, tend to cook more slowly, so place them at the bottom or along the sides of the crock-pot, ensuring that they are covered in liquid. There is no need to cook vegetables or saute onions and garlic ahead of time. Some cooks opt to do it, however, because the high heat of a saute brings out natural sugars and rich colors.