As long as the tomatoes are fairly firm, not already soft and mushy, then can be chopped in the chopper. I personally prefer the salad choppers, a knife or the mandoline, but the chopper works too.

 

If it is a Salsa recipe - tomatoes can be chopped in the Food Chopper no problem - if they end up a little bit mushy - it wont matter.

I find a Field or Roma tomato are fine in the Food chopper - but a softer tomatoe like 'vine ripe' are too soft and turn to TOTAL mush...

 

You can also help by "deseeding" the tomatoes first. I usually do this for salsa, anyway, so it doesn't turn into a watery mess by the next day!

 

We use our food choppers when our church does indian tacos as a fundraiser. You have to be careful and not over chop the tomatoes or they will be mush. But, you can do it. The salad choppers work great too.

 

I like to use chopper. Of course, it is only suitable for fresh tomatoes. But I think using it to cut onions is definitely a great idea! You only need to divide it into two parts in advance, and then put it into the cutter to cut a lot of chopped onions in one minute. The cut onions are in the holding box, and take them out when you need them. You won't cry because of onions.