At the moment the only food blender i have acce...

At the moment the only food blender i have access to is a fork. As you can imagine i cant exactly get the food smooth enough for my 5mth DD, so for the last week and next week she's getting bought jar/tin food. what i dont understand is, if its so important to introduce A food at a time, why can you not buy a tin/jar of ONE vegetable or fruit only? they are always mixed with at least one other fruit/vegetable. doesnt this defeat the purpose of slowly introducing foods? I'm so worried at the moment that she'll have a reaction, and because i wont know what it was to, and i'll have to try each food again indervidually and i dont want to cause a 2nd reaction. I know the chances are slim that she'll be allergic to something, but it happens everyday, so why dont the big companies make it easier and make single vegetable or fruit meals??