I think the blogger was trying to write this two different ways. He/she could have said tried to veganize or just veganized, and wound up using both.
I used to be addicted to cheese before I went vegan, so one of the first things I tried to veganize was cheese.
Or: I used to be addicted to cheese before I went vegan, so one of the first things I veganized was cheese.
That's assuming, of course, that veganized is a word.
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