Slow cookers are a wonderful way to have food “cook itself.” If you’re not used to using one, knowing some tips and tricks ahead of time can help reduce the learning curve. Even if you do use your slow cooker frequently, it’s nice to expand your recipe repertoire and learn something new about this stand-by of busy kitchens. Here are some tips and tricks for successful slow cookery.   1. Don’t Peek! When you’re using your slow cooker, leave the lid on unless the recipe directs you not to. If you take the lid off during cooking, it can take up to 25 minutes for the food to resume its…