It all depends on where you live!!
Chopped Tomatoes
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On average, four diced Roma tomatoes will equal one cup. One cup of diced Roma tomatoes contains 40 calories and 0 grams of fat.
800g is 0.8kg
canned tomatoes w/ green chilies
diced tomatoes
you roll a dice and yell, TOMATO
No, diced are more chunky chunks of tomatoes, where as crushed looks more like a sauce to me. I guess it's preference to. I like to use diced with my lasagna but some people prefer crushed.
Stewed tomatoes are cooked or stewed and diced tomatoes are cut into pieces but all tomatoes remain tomatoes no matter what you do to them. Not true at all. During processing of diced tomatoes a firmer less ripe tomato is used to hold up for a smaller cut, while stewed tomatoes are from fruit that is vine ripened longer and much more flavorful. Different tomatoes and lengths of ripening vary for all canned products which affects flavor.
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Diced tomatoes