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When you have rolled your bread slices up, you should have one or more burrito shaped rolls. In order to make them into pinwheel sandwiches, take a knife and hew them into evenly-sized chunks. Cut them into bite-sized chunks that are similar in size to bites of sushi. If you want a proper measurement, cut the pieces in one inch segments. An inch length is a good bite-size for this type of sandwich. If you've sufficiently loaded your sandwiches, there's a good chance there will be ingredients that are protruding from the bread once you've rolled it up. If there's anything sticking out from your roll, snip it off as close to the roll as you can. If you're short and time and aren't trying to make perfect pinwheels, you don't necessarily have to trim the excess pieces. But doing so will make your pinwheels look more professional. Although pinwheel sandwiches do a reasonably good job of holding their shape, locking them down with a toothpick will make sure they don't unfurl before being eaten. Before you present them, impale them down the centre with one toothpick each. If you're packing the sandwiches for children, it may be best for safety's sake to go without the toothpicks. The same applies to serving the very elderly. Pinwheel sandwiches are a perfect party food. Because they look great as a finger food, you should put some effort into the way you present them on a platter. The most common way to do this is to ring them around the perimeter of the platter, working your way in as you fill the tray. Including a dipping sauce in the center of the platter will be a hit if you're serving a group. Pinwheel sandwiches are small enough to fit snugly into a kid's lunch box. Seal them in ziploc bags to preserve their freshness. Because of their small size, you should be able to pack three or four into one bag. If you're making them specifically for a child, you should fill them with his favourite ingredients.
Cut each roll into bite-size pieces. Slice off excess pieces. Secure your pinwheel pieces with a toothpick. Serve on a party platter. Pack in school lunches.