We test their ability to chop onions, looking for any missed sections and a fine even cut throughout. We slice carrots where a slicing disc is available, looking for a uniform slice size. Where a grating disc is available, we grate cheese to see how well the job is performed. And if a whisk is included, we beat egg whites to a fine consistency, to see if we could get the firm peaks ideal for making meringue We also look at the quality of the build, range of options (both provided and available extra), and any storage options.