"stir homogenized" probably just means homogenised by stirring as opposed to homogenized by mixing (homogen mischen)

would be how I would correct it - I'd understand that the ingredients were first mixed, i.e. one was added to the other, then they were "stir-homogenised", which is a sort of scientific shorthand for "homogenised by stirring". Of course, the "z" now gives way to an "s" because that's the BE style of spelling.

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Note added at 10 mins (2004-10-12 08:11:16 GMT)
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If you keep the original word order, you must add the hyphen; otherwise reword it \"mixed and then homogenised by stirring\".

Definitions of Homogenize on the Web:

To create an emulsion by reducing all the particles to the same size. In milk and salad dressings, for instance, all the fat globules are mechanically broken down until they are evenly distributed throughout the liquid.
www.nutribase.com/cookingt.shtml

become homogeneous or similar, as by mixing; "The two liquids homogenized in the blender"
www.cogsci.princeton.edu/cgi-bin/webwn

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Note added at 22 mins (2004-10-12 08:23:29 GMT)
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Meaning of HOMOGENIZE
Pronunciation: hu\'mâju`nIz

WordNet Dictionary

Definition: [v] cause to become equal or homogeneous as by mixing; \"homogenize the main ingredients\"
[v] become homogeneous or similar, as by mixing; \"The two liquids homogenized in the blender\"
[v] break up fat globules, as of dairy products; \"homogenized milk\"