Dicing tomatoes by hand can be a slow, laborious process especially if you have a lot of tomatoes to dice. A food processor is the perfect kitchen appliance that will do the job for you in a fraction of the time. The key to using a food processor for diced tomatoes is to use the pulse feature of the processor so that you do not over-process the tomatoes into a sauce like texture.
Use a sharp knife to cut the tomatoes into pieces that will fit the feed shoot on your food processors. Depending on your model, cutting the tomatoes into half's or quarters will usually be sufficient.
Set up your food processor using the regular blade that came with the machine.
Feed approximately 1/2 to 1 pound of tomato pieces into the processor.
Use the pulse button on the food processor to cycle the blade two or three seconds at a time.
Empty the food processor into a bowl once the tomatoes have been diced to the desired size.
Continue the process until all the tomatoes are diced.
Always empty the diced tomatoes in the food processor between batches. This way you can keep the dicing size consistent for all the tomatoes.
Strain the diced tomatoes through a colander if you do not wish to keep the tomato juice.
Almost any vegetable can be diced using this method in a food processor.
The more you "pulse" the machine, the finer the diced tomatoes will be.
Use only firm tomatoes for dicing. Over-ripe tomatoes will process into a more sauce like texture in a food processor.